Replace the Battery or Buy a New Phone? A Decision Checklist

A phone that no longer lasts through the day may need a battery service rather than a complete replacement. But a new battery cannot fix every reason an older phone is becoming difficult to use.

The decision is best made by combining four things: a diagnosis, the complete repair quote, remaining software support and whether the device still meets your needs. Battery health alone is not the whole answer.

Check what the repair would solve

Apple’s battery-service page provides its route for checking service options; use the appropriate country and model. Its battery information guidance explains that unverified battery information may be inaccurate. Other manufacturers have their own service and diagnostic processes.

Compare costs from today onward

Use a full written quote, including any inspection conditions, additional work and necessary transport. Compare it with the actual replacement you would buy, not an advertised starting price for a different model or condition.

As a hypothetical example, a £90 repair that provides 18 further useful months costs £5 per month. A £450 replacement used for 36 months costs £12.50 per month before resale and other costs. These are arithmetic examples, not repair prices or predictions of device life.

Repeat the calculation with a shorter repair lifetime. The result is sensitive to how long the phone remains useful, so uncertainty belongs in the decision rather than in a footnote.

How long must the repair last to be cheaper?

Using the hypothetical £12.50-per-month replacement above, the £90 repair breaks even after 7.2 useful months (£90 ÷ £12.50). It needs to last longer than that to have a lower monthly cost on these assumptions.

This calculation excludes resale, financing and later repairs on both sides. Add any material differences before choosing. A diagnosed battery fault with ample support remaining is a different proposition from an uncertain repair on a phone near its support deadline.

Check support before paying

Find the maker’s policy for the exact model and count from the relevant starting point. An advertised support duration may begin at launch, not the date you bought the device. Our software-support explainer shows how to make that distinction.

Back up important information before arranging service and follow the provider’s preparation instructions. If the battery is damaged or swollen, use professional service guidance rather than treating this article as a do-it-yourself repair tutorial.

Keep the environmental claim proportionate

Extending a useful device’s life avoids an immediate replacement purchase. This checklist does not calculate a carbon saving or prove that every repair is preferable in every case. A numerical comparison would need product-specific life-cycle evidence.

Read Apple’s company score for wider corporate context and our ethical phone-brand guide when considering alternatives. The company score cannot diagnose your phone or establish the quality of a particular repairer.

Sources checked on 24 September 2026. Dated findings and company policies may change; the publication date is not a new verification date.