At some point your phone stopped being a phone and became a battery anxiety machine. You wake up, it’s at 87%. You check it an hour later and it’s at 41%, without doing anything! By early afternoon you’re looking for a charger. By evening it’s dead and you’re wondering whether it was always this bad or whether something changed.
Something changed. But it is probably not what you think.
What actually happens to a battery over time
Phone batteries are made of lithium-ion. Every time you charge and discharge a lithium-ion battery, it loses a tiny fraction of its ability to hold a charge. This is called capacity degradation and it is completely normal. It is also completely invisible until it suddenly is not.
Most phone manufacturers consider a battery healthy if it retains 80% of its original capacity. Below that threshold, the degradation starts to become noticeable in daily use. A phone that originally lasted 12 hours on a charge now lasts around 9 or 10. That is still functional. The problem is that degradation does not stop at 80%. It keeps going. At 70% capacity your phone is lasting 8 hours. At 60% you are charging twice a day. At 50% you are essentially carrying a phone that needs to be plugged in to be useful.
The thing is, this happens gradually enough that most people adapt to it without noticing. You start carrying a charger everywhere. You plug in at your desk. You get anxious when you leave the house without a full charge. You accept this as normal. It is not normal. It is a degraded battery.
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Tell us your device and postcode. We’ll send you one email with prices from repair shops in your area — no obligation, no follow-up.
How to check your battery health right now
On an iPhone, go to Settings, then Battery, then Battery Health and Charging. You will see a percentage. Anything above 80% is considered healthy by Apple. Between 70% and 80% you will probably notice the degradation. Below 70% it is affecting your daily use in a real way.
On Android it is less straightforward because manufacturers do not all surface this information the same way. On Samsung, dial *#0228# in the phone app to access a battery diagnostic screen. On other Android devices, a free app like AccuBattery will give you a capacity estimate after a few charge cycles.
If your battery health is below 80% and your phone is otherwise working fine, you have a very easy decision in front of you.
The case for replacing the battery instead of the phone
A battery replacement for a common smartphone model in Brussels costs between 35 and 70 euros. The repair takes between 30 minutes and two hours depending on the model. You leave with the same phone, the same apps, the same everything, but with a battery that behaves like it did when the phone was new.
Compare that to a new mid-range smartphone. You are looking at 400 to 700 euros. A new device means migrating your data, reinstalling your apps, reconfiguring your settings, and spending a few weeks finding where everything went. And in three or four years, the battery in your new phone will be in exactly the same state as the battery in your current one.
The battery is a consumable part. It was always going to need replacing eventually. Most people just do not know that replacing it is an option.
The performance angle that nobody talks about
Here is something Apple quietly acknowledged a few years ago after it became public knowledge: iPhones with degraded batteries were being automatically throttled. The processor was deliberately slowed down to prevent unexpected shutdowns caused by a battery that could no longer supply consistent power under load.
The fix Apple offered was a battery replacement. The same fix is available at independent repair shops in Brussels for considerably less than Apple charges.
This matters because a slow phone and a dying battery are often the same problem. If your phone feels sluggish and the battery is also struggling, a battery replacement might solve both issues at once. It is worth checking your battery health before you conclude that your phone is too old to be useful.
When a battery replacement is not the answer
There are situations where a new battery does not make sense. If your phone is more than six or seven years old and spare parts are no longer available, the repair may not be possible or economical. If the phone has other significant problems alongside the battery, the combined repair cost might exceed what the device is worth.
A good repair shop will tell you this before starting any work. The ones in our network will diagnose your phone first and give you an honest assessment. If a repair is not worth it, they will say so. At that point, our trade-in service can collect the device for free and make sure it ends up somewhere useful rather than in a bin.
One more thing about charging habits
While you are reading this: stop charging your phone to 100% every night and stop letting it drop to 0%. Lithium-ion batteries prefer to stay between roughly 20% and 80% charge. Charging to 100% and holding it there puts the battery under stress. Regularly draining to 0% does the same.
Most modern phones have a setting called Optimised Battery Charging or similar that learns your habits and slows the final charge to reduce time spent at 100%. It is worth turning on if you have not already.
This will not fix a battery that is already degraded. But it will slow down the degradation of the new one after you get it replaced.
What to do next
Check your battery health. If it is below 80% and your phone is otherwise in good shape, book a battery replacement. It is one of the most cost-effective repairs you can make, and it genuinely extends the useful life of your device by two or three years.
We can match you with a repair shop near you in Brussels. Takes about two minutes.
Find out what a battery replacement costs near you.
Tell us your device and postcode. We’ll send you one email with prices from repair shops in your area — no obligation, no follow-up.