Troubleshooting · Power

Battery drains in hours.

A new battery fixes a worn battery. It does not fix a software drain — and people pay for replacements they didn't need every day. Here's the one number that tells you which problem you actually have.

The 30-second test: check your battery's maximum capacity (health) percentage. Below ~80% → the battery is genuinely worn, replacement is warranted. Above ~85% but draining fast → it's almost certainly software, and a new battery would change nothing. That single figure decides whether this is a paid repair or a free fix.

Find your battery health first

Lithium-ion batteries lose capacity with every charge cycle — that's normal and unavoidable. The question is whether yours has degraded enough to be the actual cause, and your phone already tracks this:

  • iPhone: Settings → Battery → Battery Health & Charging → Maximum Capacity. Apple itself flags meaningfully degraded batteries here.
  • Samsung: Settings → Battery and device care → Diagnostics (or dial the Samsung Members diagnostics) shows battery life status as Good/Normal/Weak.
  • Pixel / other Android: Settings → Battery for usage breakdown; battery health surfacing varies by model and Android version, and third-party read-outs vary in accuracy.

Write that number down. Everything below depends on it.

If health is LOW (below ~80%)

This is the straightforward case: the battery is worn and replacement is the fix. It's also one of the best-value repairs there is — a worn battery is usually the only thing wrong with an otherwise perfectly good phone, so a relatively small spend buys years more life.

2026 Australian independent-shop guide: roughly $69–$149 for most iPhone, Samsung and Pixel models. Authorised service is typically higher and slower (often posting the phone away). For your exact model the cost calculator and model pages have specific ranges.

If health is HIGH but it still drains — it's software

A new battery here is wasted money. The drain is something running the battery flat, not the battery failing to hold charge. In rough order of how often we see it:

  • A misbehaving app — one app stuck awake in the background. Settings → Battery shows the breakdown; an app you barely use sitting near the top is the smoking gun. Force-close or uninstall it and re-measure.
  • A recent update still settling — for a few days after a major update the phone re-indexes photos, mail and search. Heavy drain that started right after an update and is trending better day by day is usually this. Give it 2–3 days before judging.
  • Poor signal — a phone hunting for a weak tower or stuck on slow data burns power hard. Constant low-signal areas, or a SIM/eSIM issue, can look exactly like a dying battery.
  • An update with a genuine battery bug — it happens; vendors usually patch it. Check whether others with your model/OS version report the same, and watch for a follow-up update.

Don't skip straight to a replacement on a healthy battery. The most common expensive mistake on this symptom is paying $100+ for a new battery when an app or a settling update was the cause — the drain comes back a week later because the battery was never the problem. Confirm the health figure first.

When it's worth replacing — and when it isn't

Honest rule of thumb: if the phone is otherwise sound and the battery is genuinely worn, replacement is almost always worth it — it's the cheapest way to add years to a device you already like, and far cheaper than a new phone. The exception is a much older device where other things (screen, charging port, camera) are also degrading; at that point a battery is good money after a phone that's near the end anyway. A good shop will tell you honestly which situation you're in rather than just selling the battery.

DIY, honestly

The genuine free steps here are software: read the health number, check the per-app battery breakdown, close or uninstall the offender, let a recent update settle. Do those — they cost nothing and resolve the software cases entirely.

For an actual replacement, we won't walk you through the teardown. Modern batteries are held in with aggressive adhesive, sit behind glued glass, and on many models need pull-tabs handled carefully — a punctured or bent lithium cell is a genuine fire risk, not just a failed repair. If the battery is truly worn, this is a shop job. It's a quick, cheap one for a technician with the right tools, and the safety margin is worth it.

In Newcastle or the Hunter? Battery replacement is one of the fastest, best-value repairs a local shop does — often same-day. Our Newcastle repair guide has honest local pricing and a workshop we're comfortable pointing people to.

Common questions

My battery health is 88% but it dies by lunchtime — new battery?
Probably not. 88% is still a healthy battery — that drain pattern points to software (a background app, a settling update, or poor signal). Work the software causes first; a replacement on an 88% battery usually doesn't fix it.
It got bad right after an update — is the update the cause?
Often it's the post-update re-indexing, which settles in a few days. Sometimes it's a genuine bug the vendor later patches. Either way, give it 2–3 days and re-check before concluding the battery hardware is at fault.
Is it worth putting a new battery in a 4-year-old phone?
If the phone is otherwise fine, usually yes — a $69–$149 battery for two-plus more years beats a new phone easily. If the screen, port or camera are also failing, the maths shifts toward replacement. A good shop will give you the honest call.
Should I use a battery-saver app?
Generally no. Most third-party "battery saver" apps run constantly themselves and can make drain slightly worse. The built-in low-power/battery-saver mode in iOS/Android is the only one worth using. Identify the actual cause instead of masking it.

Next step

Health is low? Get the real number for your model.

If the battery's genuinely worn, replacement is cheap and high-value. Check your model's range before you book.

Open the cost calculator Other symptoms