Phone batteries don't fail all at once — they fade gradually, and it's easy to write off the early warning signs as "just getting old." But once a battery starts to go, the problems tend to compound. Here's what to watch for, and when it's worth a replacement instead of living with it.
If your phone is regularly below 80% health or shutting down well before it hits 0%, the battery — not the phone — is usually the problem.
The most common sign is speed of drain: a phone that used to last a full day but now needs a top-up by early afternoon. Fast, unexplained drain is one of the clearest indicators that a battery has lost capacity. A close second is unexpected shutdowns — your phone powers off at 20%, 30%, even 50%, because the battery can no longer deliver enough power under load.
Other signs worth watching for
Slow charging, a phone that runs noticeably hot while charging or under normal use, and a back panel that looks slightly swollen or lifted are all signs a battery may be degrading — the swelling especially should not be ignored, since a swollen battery is a safety issue and needs prompt replacement. Many phones will also show a battery health percentage in settings; once that number drops well below 80%, most people start to notice real-world effects on how the phone performs.
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