5 Signs Your Phone Battery Needs Replacing

If your phone used to last all day and now barely makes it past lunch, you're not imagining things. Lithium-ion batteries — the kind in every smartphone — naturally wear down over time. The good news: in most cases, a worn battery is a quick, affordable fix, not a reason to buy a new phone.

1. Your phone dies well before the day is over

This is the most obvious sign. If your screen-on time keeps shrinking even though your habits haven't changed, the battery's capacity has likely dropped. Most phone batteries are rated for around 500 full charge cycles before they start losing meaningful capacity — for a lot of people, that's somewhere between 18 months and 2 years of daily use.

2. It shuts down unexpectedly, even with battery left

A phone that powers off at 30% or 40% — and then shows a higher percentage again after restarting — is a classic sign of a battery that can no longer deliver consistent power under load. This gets more noticeable in cold weather.

3. The phone feels warm or the back is swelling

This one matters most. If you notice the back of your phone bulging, the screen lifting slightly at the edges, or the phone getting unusually warm while idle, stop using it and bring it in as soon as possible. A swollen battery is a safety issue, not just a performance one.

4. Performance randomly drops

Some phones automatically slow down processing speed when the battery can't supply consistent power — it's a built-in protection, not a bug. If your phone suddenly feels sluggish opening apps or the camera lags to launch, a battery check is worth ruling out before assuming it's something bigger.

5. It takes forever to charge, or charges in a way that feels "off"

A healthy battery charges at a predictable, steady rate. If charging feels slow even with the original cable and adapter, or the percentage jumps oddly (like going from 40% to 55% in a few seconds), that's usually the battery struggling to hold and register charge accurately.

What it costs to fix

Battery replacements are one of the most affordable repairs there is — usually much cheaper than people expect, and often done the same day. Bring your phone in for a free diagnostic and we'll tell you exactly what's going on and what it costs, no guessing required.