How to spot a tired battery
The device suddenly shuts off with charge left, the percentage jumps, it gets noticeably warm while charging or only lasts a few hours. Those are the typical signs – and usually it is a simple swap, not a new phone.
If your device dies at 30%, feels hot or only runs on the cable, it is almost always the battery – not the whole phone. The swap takes about 40 minutes.
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The device suddenly shuts off with charge left, the percentage jumps, it gets noticeably warm while charging or only lasts a few hours. Those are the typical signs – and usually it is a simple swap, not a new phone.
A battery swap does not touch photos, contacts or apps. You get the same device back, just with fresh runtime.