Grissby Tech

Category: Battery & Charging

Why batteries drain, how charging really works and how to keep your phone running longer between charges.

  • How to Check Your Phone Battery Health on Android and iPhone

    How to Check Your Phone Battery Health on Android and iPhone

    Every phone battery wears out eventually. It’s not a defect, it’s chemistry. But knowing how healthy your battery is right now can save you a lot of guesswork. Is your phone dying early because of an app, or because the battery itself is tired? Should you replace the battery, or is the phone fine and you just need to change a few settings? Is that used phone you’re thinking of buying actually a good deal?

    The answer to all of these questions starts with checking your battery health. On iPhones, it’s built right into Settings. On Android, it depends on your phone’s brand and software version, but there’s almost always a way to get useful information.

    In this guide, we’ll explain what battery health actually means, show you how to check it on iPhone and on the most popular Android phones, explain how to interpret the numbers and help you decide when it’s time for a replacement.

    📋 Table of Contents

    1. What battery health actually means
    2. Signs your battery health is declining
    3. How to check battery health on iPhone
    4. How to check battery health on Samsung Galaxy phones
    5. How to check battery health on Google Pixel phones
    6. How to check battery health on other Android phones
    7. How to interpret your battery health numbers
    8. Battery health vs app problems: how to tell the difference
    9. How to slow down battery aging
    10. When should you replace your battery?
    11. Checking battery health on a used phone
    12. Frequently asked questions
    13. Final thoughts

    You do not need any special tools for most of this. In many cases, everything you need is already on your phone. And even when your phone hides battery information, a few simple methods can give you a useful picture of how your battery is doing.

    What battery health actually means

    When people talk about battery health, they usually mean the battery’s maximum capacity compared to when it was new. A new battery is at about 100 percent. As it ages, it can store less energy, so its maximum capacity drops to 95 percent, 90 percent, 85 percent and so on.

    This is different from your battery percentage. Your phone can show 100 percent charged even when the battery’s health is 80 percent. It simply means that 100 percent now represents less actual energy than it did when the phone was new. That’s why an older phone at 100 percent doesn’t last as long as it used to.

    Two other terms are useful to know:

    • Charge cycles: one cycle means using 100 percent of the battery’s capacity, though not necessarily all at once. Using 50 percent today and 50 percent tomorrow counts as one cycle. Batteries are typically designed to keep a good portion of their original capacity after several hundred cycles, and some newer phones are rated for many more.
    • Peak performance capability: an aging battery can struggle to deliver power quickly during demanding tasks. Some phones manage performance to prevent unexpected shutdowns when this happens.

    A helpful comparison is a water bottle that slowly gets smaller over time. When it is new, a full bottle lasts you all afternoon. A year later, it still fills to the brim, but the bottle itself has shrunk a little, so a full bottle does not last quite as long. Battery health measures how much the bottle has shrunk, while the percentage tells you how full it is right now.

    Signs your battery health is declining

    Even before you check the numbers, your phone may be telling you something. Watch for these signs:

    • Battery life is noticeably shorter than it was when the phone was new, with similar use.
    • The phone shuts down unexpectedly, often at 10 to 20 percent.
    • The battery percentage jumps around, for example dropping from 30 to 10 percent in minutes.
    • The phone shuts down or struggles in cold weather.
    • The phone feels slower, especially when the battery is low.
    • The phone gets warm during light use or charging.
    • The back cover or screen appears to be lifting, which can indicate a swollen battery and requires immediate attention.

    If you notice several of these, checking battery health is the next step.

    One sign deserves special emphasis: a swollen battery. If the screen starts to lift away from the frame, the back panel bulges or the phone no longer lies flat on a table, stop using and charging it. A swollen battery can be dangerous. Do not press on it or try to fix it yourself. Take it to a professional repair service as soon as possible.

    How to check battery health on iPhone

    Apple makes this easy.

    1. Open Settings.
    2. Tap Battery.
    3. Tap Battery Health or Battery Health and Charging, depending on your iOS version.

    You’ll see:

    • Maximum Capacity: the battery’s current capacity relative to when it was new.
    • Peak Performance Capability: a message telling you whether the battery is supporting normal peak performance or whether performance management has been applied after an unexpected shutdown.
    • Battery Health status: on some models, a simple status like Normal or Service.

    On newer iPhones, you can also find more details under Settings, then General, then About, including the cycle count, the manufacture date and the date the battery was first used.

    Apple considers a battery that retains about 80 percent of its original capacity after a certain number of cycles to be in good condition. The exact rating depends on the model, with newer models designed for more cycles. If your iPhone shows a service message or a capacity well below 80 percent, it’s a good time to consider a replacement.

    If you see a message saying your iPhone was unable to determine battery health, or that the battery is not a genuine Apple part, it usually means the battery was replaced with a non-genuine part or by an unauthorized repair shop. The phone may still work, but battery health information may not be shown or may be less reliable.

    How to check battery health on Samsung Galaxy phones

    Samsung offers a few ways, depending on your model and software.

    In Settings

    On recent Galaxy phones with newer versions of One UI, you may find battery information under Settings, then Battery, then Battery information or within About phone, then Status information. Some models show battery capacity and health directly here.

    With the Samsung Members app

    The Samsung Members app, preinstalled on most Galaxy phones, includes diagnostics:

    1. Open Samsung Members.
    2. Go to Support or Get help.
    3. Tap Phone diagnostics or View tests.
    4. Choose Battery status.

    The result shows whether your battery’s life is good, normal or weak, along with its current capacity information.

    If your Samsung shows the battery as weak but you have not noticed any problems in daily use, do not panic. Run the test again after a full charge and a restart, ideally when the phone is at room temperature. Results can vary slightly depending on conditions, and a single weak result is less meaningful than a consistent pattern.

    How to check battery health on Google Pixel phones

    Newer Pixel models running recent versions of Android include a battery health screen:

    1. Open Settings.
    2. Tap Battery.
    3. Tap Battery health.

    Depending on your model, you’ll see an estimate of your battery’s capacity and whether it’s in normal condition or degraded. On some Pixel models, battery information also appears under Settings, then About phone, then Battery information, showing manufacture date and cycle count.

    Older Pixel phones may not have this screen. In that case, try the methods described below for other Android phones.

    Phone charging wirelessly next to a laptop

    Pixel phones may also show a notification when the battery is degraded, suggesting a replacement. If you see that message, it is worth taking seriously, because it is based on the phone own measurements over time rather than a single snapshot.

    How to check battery health on other Android phones

    Other brands, including Motorola, Xiaomi, OnePlus, OPPO and others, vary in what they show. Here are the most common methods:

    • Check Settings first. Search for battery health, battery information or battery status. Many brands added these screens in recent software updates.
    • Look for a diagnostics app. Some brands include a device diagnostics or phone check app. Motorola, for example, has had a Device Help app with hardware tests.
    • Try an Android dialer code. On some Android phones, typing a code like star hash star hash 4636 hash star hash star into the phone app opens a testing menu with battery information. This doesn’t work on every phone, and the information varies. Don’t change any settings in that menu.
    • Use a reputable battery app. Apps like AccuBattery estimate battery capacity by measuring how much charge goes into the battery during charging. They need a few charge cycles to give a reliable estimate, and their results are estimates, not official measurements.

    If none of these work, a manufacturer service center can test your battery with professional tools.

    Whatever method you use, check your battery health more than once over a few weeks. A single reading can be affected by temperature, recent charging and calibration. Several readings give you a much clearer and more trustworthy picture of where your battery really stands.

    How to interpret your battery health numbers

    Here’s a rough guide to what the numbers mean in real life:

    • 95 to 100 percent: excellent. The battery is new or nearly new.
    • 85 to 95 percent: good. You might notice slightly less battery life than when the phone was new, but it’s usually still fine for daily use.
    • 80 to 85 percent: fair. Battery life is noticeably shorter. Depending on your usage, you may need a midday charge.
    • Below 80 percent: worn. Most manufacturers consider this the point where a replacement makes sense, especially if you notice shutdowns or performance issues.

    Remember that capacity numbers can fluctuate slightly. Some phones recalibrate their estimates over time, so a number might go up or down by a percent or two. What matters is the overall trend.

    It is also worth thinking about your own needs. Someone who uses their phone lightly and charges it every night might be perfectly happy at 78 percent. Someone who travels, uses navigation all day or works outdoors might feel the difference at 88 percent. Battery health numbers are a guide, not a verdict. What matters most is whether the battery still fits the way you live.

    Battery health vs app problems: how to tell the difference

    Battery drain isn’t always caused by a worn battery. Before replacing anything, rule out software problems.

    If your battery health is high, say above 90 percent, but battery life is poor, the problem is likely an app, a setting or weak signal. Check your battery usage screen for apps using a lot of power in the background, review location access and screen brightness, and make sure your software is up to date.

    If your battery health is low, say below 80 percent, the battery itself is likely the main cause, though apps and settings can make it worse.

    If battery problems started suddenly after an update or after installing a new app, software is a likely culprit, even if battery health is moderate.

    A simple test helps here. Restart your phone, charge it fully, then use it normally for a day while keeping an eye on the battery usage screen. If a single app stands out, deal with that app first. If the usage looks normal but the battery still struggles, the battery itself is the likely problem.

    How to slow down battery aging

    You can’t stop battery aging, but you can slow it down.

    • Avoid heat. High temperatures are one of the biggest causes of battery wear. Don’t leave your phone in a hot car or in direct sunlight, and remove thick cases if it gets warm while charging.
    • Use battery protection features. iPhones offer Optimized Battery Charging and charging limits on newer models. Samsung, Google Pixel and other brands offer similar options that keep charge around 80 percent.
    • Avoid frequent full discharges. Letting your phone regularly drop to zero is harder on the battery than charging it partially throughout the day.
    • Use quality chargers. Reputable chargers and cables provide stable power.
    • Keep software updated. Updates often improve battery management.
    Close-up of a hand holding a modern smartphone outdoors

    Even small changes add up. Someone who keeps their phone cool, uses an 80 percent charging limit and avoids running it down to zero every day may still have a battery in good health after three years, while the same phone used in a hot car and drained daily might need a new battery after eighteen months. The phone is the same. The habits make the difference.

    If you use your phone for navigation in a car, try to mount it near an air vent instead of on the windshield or dashboard in direct sunlight. Navigation, a bright screen, charging and summer sun together are one of the toughest combinations for any phone battery.

    When should you replace your battery?

    Consider a replacement if:

    • Battery health is below about 80 percent.
    • Your phone shuts down unexpectedly.
    • You need to charge more than once a day with moderate use.
    • Your phone shows a service warning for the battery.
    • The battery appears swollen, which requires immediate professional attention.

    A battery replacement is usually much cheaper than a new phone and can make a two or three year old phone feel much better. Use an authorized service provider or a reputable repair shop that uses quality parts. On some phones, using non-genuine parts may cause warning messages or affect features like battery health reporting.

    Before your appointment, back up your phone. Battery replacements are routine, but any repair carries a small risk, and some service centers may need to reset the device during testing. A fresh backup means you can relax and let the technician do their job.

    Checking battery health on a used phone

    If you’re buying a used phone, always check the battery health before paying.

    • On an iPhone, ask the seller to show you Settings, then Battery, then Battery Health, and the cycle count under About if available.
    • On a Samsung, ask them to run the battery test in Samsung Members.
    • On a Pixel, check the battery health screen if available.

    A phone with low battery health isn’t necessarily a bad buy, but you should factor the cost of a battery replacement into the price.

    Also ask the seller when the battery was last replaced, if ever. A recently replaced battery with high health is a nice bonus. A phone that is several years old with original battery and suspiciously high health on a third-party app is worth checking more carefully with official tools.

    Frequently asked questions

    Is 85 percent battery health good?

    It’s reasonable. You’ll likely notice somewhat shorter battery life than when the phone was new, but most people can still get through a day with moderate use.

    Can battery health go back up?

    Not truly. Battery wear is permanent. Sometimes the displayed number rises slightly after the phone recalibrates its estimate, but the battery itself isn’t recovering.

    How long does a phone battery last?

    Most phone batteries keep good health for about two to three years of typical use. Heavy use, frequent heat exposure and lots of full discharges can shorten that.

    Are battery health apps accurate?

    Third-party apps provide estimates based on charging behavior. They can be helpful, especially over several charge cycles, but official tools from your phone maker are more reliable.

    Does fast charging lower battery health?

    Fast charging can create more heat, and heat speeds up wear. Modern phones manage fast charging carefully, so normal use is fine. Avoid heavy use and heat while fast charging.

    Is it safe to replace a battery myself?

    It’s possible on some phones with the right tools and parts, but it carries risks, including damage to the phone and to the battery itself. For most people, an authorized service center is the safer choice.

    Final thoughts

    Checking your battery health takes less than a minute and tells you a lot about your phone. On iPhone, it’s right in Settings. On Android, check Settings first, then use your manufacturer’s diagnostic tools. If health is high but battery life is poor, look at apps and settings. If it’s low, a battery replacement may be the most cost-effective upgrade you can make. And whatever your current number is, keeping your phone cool and using battery protection features will help it stay healthy for longer.

  • How to Choose a Power Bank That Actually Fits Your Phone

    How to Choose a Power Bank That Actually Fits Your Phone

    A power bank seems like the simplest gadget in the world. It’s a battery in a box. You charge it, you carry it, you plug your phone into it when you’re running low. But anyone who has bought one knows it’s not quite that simple. The 20,000 mAh power bank that should charge your phone five times barely manages three. The one you bought for its speed charges your phone painfully slowly. The one you packed for a trip gets stopped at airport security.

    The problem isn’t that power banks are complicated. It’s that the numbers on the box don’t tell the whole story, and a few details make the difference between a power bank you love and one that sits in a drawer.

    In this guide, we’ll explain what capacity really means, why you never get the full number printed on the box, how to match a power bank to your phone’s charging speed, what ports and features to look for, how to travel with one safely and how to spot cheap power banks that aren’t worth buying.

    📋 Table of Contents

    1. Start with how you’ll actually use it
    2. Capacity explained: why you never get the full number
    3. Match the charging speed to your phone
    4. Ports, recharging and useful features
    5. Size and weight: find the balance
    6. Flying with a power bank
    7. Safety: avoid cheap and counterfeit power banks
    8. How to take care of your power bank
    9. Frequently asked questions
    10. Final thoughts

    We will keep the technical side as simple as possible. You do not need to understand battery chemistry to make a good choice. You just need to know which three or four numbers matter, and how to read them in a way that reflects real life rather than marketing.

    Start with how you’ll actually use it

    Before looking at specifications, think about your situation. The right power bank for one person is the wrong one for another.

    • Daily top-ups: if you just need an extra 30 to 50 percent to get through a long day, a small, light power bank around 5,000 mAh is often enough. It fits in a pocket or small bag.
    • Full recharges: if you want to fully recharge your phone once or twice, look at 10,000 mAh models. They’re the most popular size for good reason.
    • Travel and multiple devices: for long trips, camping or charging a phone, tablet and headphones, consider 20,000 mAh or more.
    • Laptops: some USB-C laptops can charge from power banks, but they need high-wattage output, often 45 to 100 watts, and a large capacity.

    Bigger isn’t always better. A large power bank is heavier, takes longer to recharge itself and may be overkill if you only need a small boost.

    It also helps to think about how often you will actually use it. A power bank you need every day should be small enough to live in your bag permanently. One you only need for trips can be larger, since you will pack it deliberately. Many people end up owning two: a slim one for daily life and a bigger one for travel.

    Capacity explained: why you never get the full number

    Power bank capacity is listed in mAh, or milliamp-hours. It’s tempting to divide the power bank’s capacity by your phone’s battery capacity and assume that’s how many charges you’ll get. For example, a 10,000 mAh power bank and a 5,000 mAh phone battery should mean two full charges, right?

    In practice, you’ll usually get noticeably less. There are two main reasons.

    Voltage conversion

    Power bank capacity is usually measured at the internal battery cells’ voltage, around 3.7 volts. When the power bank charges your phone, it converts that to USB output voltage, often 5 volts or higher for fast charging. That conversion means the usable capacity at the output is lower than the number on the box. Many good power banks list a rated capacity on the label, which reflects what you can actually get out.

    Energy losses

    Some energy is lost as heat in the power bank, the cable and the phone’s charging circuitry. Wireless charging from a power bank loses even more.

    A realistic rule of thumb

    Expect to get roughly 60 to 70 percent of the advertised capacity into your phone. So a 10,000 mAh power bank typically delivers around 6,000 to 7,000 mAh to your phone. With a phone that has a 5,000 mAh battery, that’s a bit more than one full charge, not two.

    Using watt-hours, often written as Wh, is a more accurate way to compare power banks. Many manufacturers print it on the label. It’s also the number airlines care about, as we’ll see later.

    This is not the power bank cheating you. It is simply how the physics works, and every honest manufacturer faces the same losses. The difference is that some brands are more transparent about it, printing both the cell capacity and the rated output capacity, which makes comparison much easier.

    Keep in mind that your phone is also using energy while it charges, especially if the screen is on. Charging from a power bank while scrolling or navigating means more of that energy is consumed immediately rather than stored. For the most charge per power bank, plug in, lock the phone and let it charge undisturbed.

    Match the charging speed to your phone

    Capacity tells you how much energy you carry. Output tells you how fast you can use it. A big power bank with slow output will take ages to charge your phone.

    Check your phone’s charging standard

    Most modern phones use USB Power Delivery, or USB PD, for fast charging over USB-C. iPhones and Google Pixel phones use it, as do many other Android phones. Samsung’s fastest charging modes use PPS, an extension of USB PD. Some brands use their own proprietary fast charging systems.

    For most people, a power bank with a USB-C port that supports USB PD at 20 watts or more is a great choice. If you have a recent Samsung Galaxy and want its fastest speed, look for PPS support at the appropriate wattage.

    Watts matter more than amps

    Power banks list output in watts, volts and amps. The number that matters most for speed is watts. A 20 watt output is enough for fast charging most phones. 25 to 45 watts suits some Samsung and other Android phones. Higher outputs mainly matter for tablets and laptops.

    Remember the cable

    Even the best power bank won’t fast charge your phone through a cheap, low-rated cable. Use a good quality USB-C cable rated for the power you need.

    Hands holding a smartphone connected to a power bank outdoors

    If you own several devices from different brands, a power bank with USB PD and PPS support covers most of them well. It might not reach the absolute maximum speed of every proprietary system, but it will charge everything reasonably fast, which is usually more useful than being perfect for just one phone.

    Ports, recharging and useful features

    USB-C is the priority

    Look for at least one USB-C port that works as both input and output. It charges your phone quickly and recharges the power bank quickly. USB-A ports are useful for older cables and accessories, but they’re usually slower.

    How fast does the power bank recharge itself?

    This is often overlooked. A 20,000 mAh power bank with slow input can take many hours to recharge. Look for a high input wattage, ideally via USB-C PD, so it refills overnight or in a few hours.

    Pass-through charging

    Some power banks can charge your phone while they’re plugged into the wall, which is called pass-through charging. It’s handy when you have only one wall outlet. Not all models support it, and some do it more slowly.

    Built-in cables

    Power banks with built-in cables are convenient, because you don’t need to remember a separate cable. Make sure the built-in cable matches your phone’s port.

    Displays and indicators

    A digital display showing the exact percentage is more helpful than four small lights. It tells you exactly when the power bank needs charging.

    Wireless and magnetic power banks

    Magnetic wireless power banks snap onto compatible phones, including iPhones with MagSafe and some Android phones with magnetic cases. They’re convenient, but wireless charging is less efficient and generates more heat, so you’ll get fewer charges from the same capacity.

    When reading product listings, check that the advertised fast charging output is available on the port you plan to use. Some power banks only offer full speed on one specific USB-C port, while other ports are slower. If you plan to charge two devices at once, check how the total output is shared between them.

    Size and weight: find the balance

    Capacity adds weight. A 5,000 mAh power bank might weigh little more than a deck of cards. A 20,000 mAh model can weigh as much as a smartphone or two. Before buying, think about where you’ll carry it. If it’s too heavy, you’ll leave it at home, and a power bank at home doesn’t help anyone.

    For most people, a 10,000 mAh power bank with 20 watt USB-C PD output is the sweet spot between capacity, speed and portability.

    A good way to decide is to hold something of similar weight in your bag for a day. If it feels annoying, choose a smaller power bank. Many people find that two small charges during a day are more practical than carrying one heavy brick around. You can always top up the small power bank whenever you sit down near an outlet, at a cafe, at work or on a train.

    Shape matters too. Slim, flat power banks slide easily into pockets and laptop sleeves, while thick cylinders can be awkward. Some models are designed to sit flush against the back of a phone so you can hold both together while charging, which is handy when you need to keep using the phone.

    Flying with a power bank

    Airlines have specific rules for power banks because they contain lithium batteries.

    • Carry-on only. Power banks must usually go in your carry-on bag, not checked luggage.
    • Watt-hour limits. Many airlines and aviation authorities allow power banks up to 100 Wh without special approval. Between 100 and 160 Wh may require airline approval. Above 160 Wh is generally not allowed. A typical 20,000 mAh power bank is around 74 Wh at 3.7 volts, which is within the common limit.
    • Labels matter. Make sure the capacity in Wh or mAh is clearly printed. Unlabeled power banks may be confiscated.
    • Airline rules vary. Some airlines have additional restrictions, such as not allowing power banks to be used or charged during the flight. Always check your airline’s current rules before you travel.

    To convert mAh to Wh yourself, multiply mAh by the voltage, usually 3.7, and divide by 1,000. For example, 10,000 mAh times 3.7 divided by 1,000 equals 37 Wh.

    If you are unsure whether your power bank qualifies, look at the label before you leave home. If the capacity is printed only in mAh, do the quick conversion described above and write the Wh number down. It can save an awkward conversation at the security checkpoint, and it shows staff you know the rules.

    Safety: avoid cheap and counterfeit power banks

    A power bank is a large lithium battery that you carry close to your body. Quality matters.

    • Buy from reputable brands and sellers. Counterfeit and low-quality power banks are common online.
    • Be wary of unrealistic claims. A tiny, very cheap power bank claiming 30,000 mAh or more is a red flag.
    • Look for safety protections, such as overcharge, over-discharge, short-circuit and temperature protection.
    • Check certifications relevant to your region.
    • Stop using damaged power banks. If a power bank is swollen, dented, unusually hot or smells strange, stop using it and dispose of it at a battery recycling point.
    Hand holding a blue power bank with built-in cables

    Price can be a useful signal. Quality power banks with genuine capacity and proper safety circuits cost a certain amount to make. If a listing is dramatically cheaper than well-known brands with the same specifications, it is worth asking why. With batteries, saving a few dollars is rarely worth the risk.

    How to take care of your power bank

    • Don’t leave it empty for long periods. Store it partly charged, around 50 percent if you won’t use it for months.
    • Avoid heat. Don’t leave it in a hot car or direct sunlight.
    • Recharge it every few months even if you don’t use it, so it’s ready when you need it.
    • Use good cables and chargers to recharge it.
    • Replace it when it wears out. Like phone batteries, power banks lose capacity over time.

    It is also a good idea to label your power banks if you own several, with the purchase year written on a small sticker. After two or three years of regular use, you may notice they no longer last as long. Knowing roughly how old each one is helps you decide when to retire it and buy a fresh one.

    When a power bank reaches the end of its life, do not throw it in the regular trash. Lithium batteries can cause fires in garbage trucks and recycling facilities. Take it to an electronics store, a recycling center or a battery collection point, many of which accept old power banks for free.

    Frequently asked questions

    How many times will a 10,000 mAh power bank charge my phone?

    Usually about one to two full charges for most modern phones, depending on the phone’s battery size and charging efficiency. Expect around 60 to 70 percent of the advertised capacity to reach your phone.

    Can a power bank damage my phone?

    A quality power bank from a reputable brand won’t damage your phone. Cheap, uncertified power banks may lack proper protections and are best avoided.

    Is it okay to leave my phone connected to a power bank?

    Yes. Your phone stops charging when it’s full. Just avoid leaving the phone and power bank in a hot place.

    Why does my power bank charge my phone slowly?

    Common reasons include using a USB-A port instead of USB-C, a low-quality cable, a power bank that doesn’t support your phone’s fast charging standard, or several devices charging at once.

    Can I take a power bank on a plane?

    Usually yes, in your carry-on bag, if it’s within the airline’s watt-hour limits, commonly up to 100 Wh. Check your airline’s rules before flying.

    Are wireless power banks worth it?

    They’re convenient, especially magnetic ones, but they’re less efficient than wired charging and produce more heat. If you value maximum capacity and speed, wired is better.

    If you are still unsure what to buy after reading this guide, start with a well-reviewed 10,000 mAh power bank with a USB-C PD port from a reputable brand. It is the safest all-round choice for most phones and most people. You can always add a larger or smaller one later once you understand how you actually use it.

    Final thoughts

    The right power bank depends on how you’ll use it. For most people, a 10,000 mAh model with a USB-C port supporting 20 watt USB PD fast charging hits the sweet spot. Expect to get about two-thirds of the advertised capacity into your phone, use a good cable, buy from a reputable brand and check airline rules before you travel. Choose well, and a power bank becomes one of those small gadgets you’ll be grateful for every time your battery runs low far from an outlet.

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