How to Extend Your Phone's Battery Life

A phone battery's lifespan is measured in charge cycles, not years — and a handful of genuinely effective habits can meaningfully slow down how fast yours wears out. Here's what actually works, separated from the myths.

Avoid extreme heat, more than extreme cold

Heat is genuinely the biggest enemy of battery health — far more damaging than cold. Leaving your phone in direct sunlight, on a car dashboard, or charging it under a pillow (which traps heat) causes real, permanent capacity loss over time. A phone that runs hot while charging is doing more damage to itself than one charging at room temperature.

You don't need to avoid the charger overnight

Modern phones stop charging once they hit 100% and only top up occasionally overnight, so leaving it plugged in isn't the battery killer it used to be a decade ago. If you're concerned, many phones now have an "optimised charging" or similar setting that learns your routine and delays the final charge to reduce time spent at 100%, which does help slightly — worth switching on if your phone offers it.

Keep it between 20% and 80% when you can

This is the single most effective habit for slowing wear, if you're able to do it: batteries experience the least chemical stress in the middle of their charge range. Running all the way down to 0% regularly, or sitting at 100% for long periods, both accelerate wear more than staying in that middle band.

Dim the screen and manage background apps

The screen is usually the single biggest drain on a phone's charge day-to-day. Lowering brightness, using dark mode on an OLED/AMOLED screen (which uses genuinely less power to display black pixels), and checking which apps are refreshing in the background all reduce how often you need to charge — which itself slows down long-term wear.

Use the charger that came with it, or a certified equivalent

Cheap, uncertified chargers can deliver power inconsistently, which puts more stress on the battery over time than a genuine or certified fast charger designed to communicate properly with your phone.

When habits aren't enough any more

Good habits slow wear, but every battery eventually needs replacing — that's chemistry, not a fault. If your battery health has already dropped below around 80%, no amount of good habits will bring that capacity back. At that point, a replacement is genuinely the only fix, and it starts from £29.