How to Spot When Your Phone Battery Needs Replacing
The good news is that batteries will usually start to leave clues before they fail completely. Knowing how to check your phone battery health can help you spot the warning signs early, understand what’s normal, and know when it might be time to take action.
Is your battery trying to tell you something?
Batteries rarely go from “working perfectly” to “completely useless” overnight. Before they give up, they usually leave behind a few signs. If you’ve been wondering, “why is my phone battery draining so fast?”, it’s worth paying attention to the small changes that appear over time.
Your screen-on time has shrunk
Screen-on time is simply how long your phone can actively be used before the battery runs out. It includes everything from scrolling through apps and watching videos to browsing the web or replying to messages.
You can usually check your screen-on time in your phone’s battery settings, or through tools like Digital Wellbeing on Android. Don’t worry if the numbers change slightly from one day to the next – that’s completely normal. The sign to look out for is a noticeable drop over a number of weeks or months.
Random shutdowns, even with charge to spare
One of the most frustrating battery problems is your phone turning off when it still appears to have plenty of power left. Seeing your device shut down at 20% or 30% can feel like your battery percentage is making things up, but there’s usually a reason behind it.
As batteries age, they can become less capable of delivering the power your phone needs during demanding moments, like opening apps, using the camera, or connecting to a network. The battery might still show charge remaining, but it can struggle to maintain the voltage needed to keep your phone running.
Your phone runs hot doing next to nothing
Some warmth in your device is perfectly normal. Your phone might heat up while gaming, using navigation, charging, or recording video for a long time. But if it’s getting hot while you’re just texting, browsing, or sitting idle, it could be a sign something isn’t quite right.
An ageing battery can be more prone to generating excess heat, and in more serious cases, damage to the battery cells can lead to swelling. We’ll cover what that looks like and what to do later in this guide.
Charging takes longer, or the percentage does its own thing
If your phone suddenly takes much longer to charge, or the battery percentage seems to jump around, your battery could be showing signs of wear. For example, going from 80% to 62% in a short space of time isn’t something you’d expect during normal use.
That said, don’t assume every battery issue means your hardware is failing. Software bugs, background apps, or a recent update can sometimes cause unusual battery behaviour too. Before replacing anything, it’s worth checking for updates, restarting your phone, and seeing if the problem continues.
Why is my phone battery draining so fast, anyway?
If your battery seems to be disappearing faster than usual, it’s easy to assume something has gone wrong. But there are plenty of reasons why your phone battery might be draining quickly, and not all of them mean your device needs replacing.
Here are some of the most common causes:
- Background apps and location services: Apps often use power in the background through syncing, notifications, location tracking, and features like GPS or 5G.
- A bright screen and always-on display: High brightness, longer screen time, and always-on display features can all increase how much energy your phone uses throughout the day.
- An ageing battery: As a battery gets older, its ability to hold the same amount of charge naturally decreases due to changes in its internal chemistry.
- Too much heat: Exposure to hot environments, like a sunny car dashboard or direct sunlight, can put extra stress on your battery and speed up ageing.
- Charging habits: Using poor-quality chargers, charging in hot conditions, or frequently letting your battery drop to 0% can contribute to faster wear over time.
- A software issue: A buggy app, a recent update, or a background process can sometimes cause unusual battery drain without the battery itself being the problem.
You can read our guide on Why is My Phone Battery Draining So Fast to see what apps could be sapping the power.
How to check your phone’s battery health in under a minute
You don’t need any specialist tools or complicated apps to check your phone battery health. Most devices let you see useful battery information directly in your settings.
On Android, the exact wording can vary depending on your device, but you’ll usually find battery information by going to Settings > Battery and looking for options such as Battery health or Battery information. Some phones also show details like battery usage, charging habits, and features designed to help your battery last longer.
On motorola phones, you can find a battery health snapshot directly in Settings > Battery, alongside Smart Charging tools that help to manage charging patterns, such as slowing overnight charging to reduce unnecessary wear over time.
If you’re using an iPhone, you can check the same kind of information by heading to Settings > Battery > Battery Health & Charging, where you’ll find your battery’s maximum capacity and any important service messages.
It’s usually best to avoid third-party “battery doctor” or battery optimisation apps that promise to fix your battery health. Many will just show you information that you can already access in your phone’s settings, and some can be unreliable.
What battery health number should you be looking out for?
Many manufacturers consider around 80% capacity to be the point where a battery may start to show noticeable ageing, and your phone might recommend a service or replacement if performance is affected.
Spotted a swollen phone battery? Stop scrolling and read this
Most battery issues are annoying, but a swollen battery is something you should take seriously. If you notice signs of swelling, stop using your phone and deal with it safely rather than trying to carry on as normal.
A swollen phone battery can be spotted by a few tell-tale signs, including a raised or distorted phone body or even a small bulge or gap in the phone’s body that wasn’t there before.
A swollen battery happens when gas builds up inside a damaged or ageing battery cell, and it’s a genuine safety concern rather than just a cosmetic issue.
If you think your battery is swollen, stop using your device straight away and don’t charge it. Don’t press on the swelling, try to puncture it, or attempt to remove the battery yourself.
Instead, take your device to a professional repairer or an official recycling point that can safely handle batteries. Never put a swollen battery or phone containing one in your household waste.
How long should a phone battery last?
Realistically, a phone battery should last two to three years of daily use before you’re likely to notice a significant drop in capacity. That doesn’t mean your phone suddenly stops working after this point, but you might find that you need to charge more often as the battery naturally loses some of its ability to hold power.
You can help to extend your battery’s lifespan with just a few simple habits. Keeping your phone away from extreme heat, avoiding unnecessary full drains to 0%, using reliable chargers, and managing things like screen brightness and background apps can all help to reduce stress on the battery.
On the other hand, regularly exposing your phone to hot conditions while charging, relying on poor-quality chargers, or repeatedly pushing your battery from full to empty can speed up wear.
Battery technology is also continuing to improve. Newer battery designs, including silicon-carbon batteries used in some of motorola’s latest foldables such as the motorola razr 70 ultra, can fit more capacity into smaller spaces and are changing what we expect from everyday battery life.
Decision time: repair or replace?
Once you’ve checked your battery health and spotted the warning signs, the next question is what to do about it. In general, a battery health level below around 80%, especially alongside issues like unexpected shutdowns or noticeably shorter battery life, is a good indication that it might be time to consider your options.
When a battery replacement makes sense
A battery swap can be a great choice if your phone is otherwise working well. If the screen, camera, performance, and software are all still meeting your needs, replacing the battery could give your device a new lease of life without the cost of buying a completely new phone.
However, whilst DIY battery replacements can seem like a way to save money, they aren’t always straightforward. Many modern phones use sealed designs, strong adhesives, and components that can be damaged without the right tools and experience. For the safest option, a professional repair is usually the best choice.
Recycle your old battery responsibly
If you do replace your battery or upgrade your phone, don’t throw old batteries or devices into household waste. Batteries need to be recycled through appropriate e-waste schemes, manufacturer take-back programmes, or official recycling points to ensure they’re handled safely.
You can see our guide on how to dispose of your old mobile phone for more information on device recycling.
When it’s time for a new phone
Sometimes replacing the battery isn’t the best option. If your phone needs multiple repairs, can no longer receive important software updates, or the cost of a battery replacement comes close to buying a newer device, upgrading might make more sense.
Newer phones are also designed with battery health in mind from the start, with smarter charging features and tools that help you understand and manage battery performance over time. So, when you choose your next device, keep battery longevity in mind alongside the features you’ll use every day.
Take a look at motorola’s latest devices to find a phone built to keep up with your everyday life.
