30 jours d'essai gratuit.

When buying a used cell phone, it's essential to check its battery condition . A degraded battery can lead to reduced battery life and poor performance. In this article, we'll explain how to assess the battery condition of a used phone to avoid any unpleasant surprises.


Why is it important to check the battery condition?

Over time, batteries lose their original capacity, which can cause:

โœ… Reduced autonomy.
โœ… A phone that suddenly turns off.
โœ… Slower or irregular charging.

Before buying a used phone, it is therefore crucial to examine the condition of its battery.


1. Identify whether the battery is removable or integrated

๐Ÿ”น Removable batteries : Easy to replace, available on some older models.
๐Ÿ”น Built-in batteries : Present on the majority of modern smartphones, require technical intervention to be replaced.


2. Check the physical wear of the battery

Signs of a bad battery:

โŒ Swollen battery.
โŒ Deformation of the back of the phone.
โŒ Excessive overheating during use.

โžก๏ธ Solution : If the battery is in poor condition, it is best to replace it before use.


3. Check battery status via phone settings

On iPhone :

1๏ธโƒฃ Go to Settings โ†’ Battery โ†’ Battery Health .
2๏ธโƒฃ Check the maximum capacity (below 80%, the battery is worn out).

On Android :

1๏ธโƒฃ Go to Settings โ†’ Battery โ†’ Battery usage .
2๏ธโƒฃ Check for any alerts indicating a degraded battery.


4. Use apps to test the battery

Recommended applications:

โœ”๏ธ AccuBattery (Android)
โœ”๏ธ CoconutBattery (Mac/iPhone)
โœ”๏ธ Battery Life (iPhone)


5. Test the phone's real battery life

Quick test : Charge the phone to 100% and note how long it lasts under normal use.

Low battery indicators :

โŒ Battery drains very quickly.
โŒ Phone turns off before 0%.


6. Check the number of battery charge cycles

๐Ÿ“Œ One charge cycle = one full charge from 0% to 100%.

๐Ÿ”น On iPhone : Use CoconutBattery or Battery Life .
๐Ÿ”น On Android : Use AccuBattery to estimate cycles.

โžก๏ธ Beyond 500 cycles, the battery begins to lose performance.


What to do if the battery is in bad condition?

โœ”๏ธ Replace the battery (if possible).
โœ”๏ธ Use a power bank to extend battery life.
โœ”๏ธ Call a professional repairer .


Tips for extending the life of a used battery

โœ… Avoid full charges to 100% all the time.
โœ… Use a suitable and certified charger.
โœ… Do not leave the phone plugged in overnight.
โœ… Avoid excessive heat, which accelerates battery degradation.


Checking the battery condition before buying a used cell phone is essential to avoid unpleasant surprises. By following these steps, you can be sure of getting a phone with decent battery life and optimal performance.