Every battery wears out. The question is not whether yours is ageing — it is — but whether it is ageing badly enough to be worth opening the phone up for. Here is how we judge that in the workshop, and when we tell people to leave well alone.
Signs it is time
Fast drain is the obvious one: a phone that used to last the day now needs charging by lunchtime, even with normal use. Unexpected shutdowns are a stronger signal — if the phone dies at 20% or 30% in the cold, the battery can no longer deliver the power the phone asks for. And then there is swelling. If the back or screen is lifting, the phone rocks on a flat surface, or the case no longer sits flush, stop using it and get it replaced safely. A swollen battery is a safety issue, not a cosmetic one, and it should never be punctured, squeezed or charged while swollen.
What battery health percentage actually means
Battery health is a rough estimate of how much capacity remains compared with when the battery was new. It is useful, but it is not a verdict. Two phones can show similar percentages and behave very differently, because the number does not capture how the battery copes under load, in the cold, or after a knock. Treat it as one clue, not the whole diagnosis.
What a replacement actually involves
A battery is not a five-minute job, whatever online videos suggest. It is held in place with strong adhesive, often tucked under other components, and it has to be prised out carefully without bending or puncturing it. A careful technician warms the adhesive, works slowly, and tests the phone properly afterwards. Rush the job and you risk damaging the screen, the frame or the new battery itself.
When to leave it alone
If the wear is mild, the phone still gets through your day with a top-up, and you plan to replace the phone soon anyway, a new battery may not be worth the cost or the risk of opening a phone that is otherwise working fine. Save the repair for a phone you intend to keep.
Takeaway
Replace on symptoms, not on a number alone. Fast drain, shutdowns and especially swelling are the real reasons to act — a percentage on a settings screen, on its own, is not.
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