You charged it to 100% this morning, and by 2pm it’s gasping at 20%. Sound familiar? A phone battery draining quickly is one of the most common complaints I hear, and the frustrating part is it’s rarely the battery’s fault — it’s usually a handful of settings and apps quietly burning through power in the background. Here’s how to stop your phone battery draining so quickly, with fixes that work on both iPhone and Android.
First: find out what’s actually eating your battery
Don’t guess — look. Both iPhone and Android show exactly which apps used your battery over the last 24 hours. On iPhone: Settings > Battery, then scroll down. On Android: Settings > Battery > Battery usage. This screen is genuinely revealing. Most people discover one app — often a social media app, a game, or something running location in the background — is responsible for a shocking share. I once found a weather widget using 18% of my battery. A widget! Check this screen first, because it tells you exactly where to aim.
How to stop phone battery draining: the biggest wins
Turn down screen brightness — or let the phone do it. Your display is almost always the single biggest power draw. Dropping brightness from 100% to 60–70% makes a real difference, and most people can’t tell the difference indoors. Better yet, turn on adaptive/auto brightness and let the phone manage it. Also shorten your screen timeout to 30 seconds — every minute your screen sits on while you make tea is wasted power.
Kill background app refresh for apps that don’t need it. Dozens of apps refresh content in the background “just in case” — news, shopping, social media. On iPhone: Settings > General > Background App Refresh, and switch it off for anything non-essential (keep it for messaging and email). On Android: Settings > Apps > select app > Battery > Restricted. Your apps will still work perfectly when you open them; they just won’t sip power while you sleep.
Tame location services. GPS is a notorious battery hog. Go through Settings > Privacy > Location Services (iPhone) or Settings > Location (Android) and set most apps to “While Using” or “Never”. Very few apps genuinely need “Always”. Weather, maps and ride-hailing need it sometimes; your supermarket loyalty app does not.
The connectivity tweaks that add up
Your phone’s radios — WiFi, Bluetooth, mobile data, 5G — all cost power, and they’re dumb about it: they’ll keep shouting into the void trying to hold a weak signal.
- In a weak-signal area, your phone works overtime. If you’re somewhere with one bar, consider airplane mode with WiFi on instead — it’ll save enormous power. This is also why 5G can drain battery faster in patchy coverage areas; forcing 4G in settings can help.
- Turn off WiFi and Bluetooth when you’re out all day and not using them. Your phone constantly scans for networks and devices otherwise.
- Disable “WiFi Assist” / “Adaptive WiFi” quirks that keep mobile data active alongside WiFi — check your settings.
- Use WiFi calling at home if your signal is poor indoors; it stops the phone straining to hold a weak mobile signal.
Notifications: the death of a thousand vibrations
Every notification wakes your screen, buzzes the motor, and fires up the radio. If you get 200 notifications a day, that’s 200 tiny battery hits. Go to notification settings and be brutal: keep messaging, calls and banking; mute everything else, or at least silence the screen-wake. Your battery — and your sanity — will thank you. I did this audit last year and my screen-on time dropped by nearly an hour a day without me missing anything important.
The software and battery-health basics
Keep your software updated. It sounds counterintuitive, but updates frequently include power-efficiency fixes. A phone stuck on a two-year-old OS version is often thirstier than it needs to be.
Check your battery health. On iPhone: Settings > Battery > Battery Health & Charging shows maximum capacity. If it’s under 80%, the battery is genuinely worn and no setting will fix it — that’s a battery replacement (£50–£90 at Apple or a reputable repair shop), not a settings problem. Android doesn’t show this natively on all phones, but apps like AccuBattery estimate it.
Restart weekly. Memory leaks and stuck processes accumulate. A weekly restart is the simplest maintenance there is.
Extreme heat kills batteries. Don’t leave your phone on a sunny dashboard or charge it under your pillow. Heat degrades lithium batteries permanently — cold just temporarily reduces capacity. If your phone gets hot during normal use, something’s wrong; check the battery usage screen.
Charging habits: what actually matters
There’s a lot of mythology here. The truth, backed by battery researchers: lithium batteries last longest when kept between roughly 20% and 80% charge. Charging to 100% and leaving it there isn’t catastrophic, but consistently doing it for two years shaves months off the battery’s life. Both iPhone (“Optimised battery charging”) and many Android phones now offer an 80% charge limit option — turn it on if you charge overnight. And yes, overnight charging itself is fine with modern phones; read our full answer on whether it’s safe to charge your phone overnight if you’re nervous.
Avoid cheap no-name chargers — not because they’ll explode (they almost certainly won’t), but because poor voltage regulation generates heat, and heat is the enemy. A £12 charger from a reputable brand is fine; a £2 one from a market stall is a false economy.
When it’s the battery, not the settings
Sometimes you’ve done everything right and the phone still dies by lunch. Signs the battery itself is finished: it drops from 30% to dead in minutes, the phone shuts off in the cold, or the back of the phone is swelling (stop using it immediately if it swells — that’s a safety issue). For phones under two years old, this is unusual and worth a warranty claim. For older phones, a battery replacement is far cheaper than a new phone — and if you’re considering upgrading anyway, check whether buying a refurbished phone makes more sense than buying new.
The 10-minute battery tune-up
The 20–80% charging advice in this article is backed by Battery University’s research on lithium-ion longevity — worth a read if you want the science.
Here’s the quick routine: check battery usage and restrict the worst offender, turn on auto-brightness with a 30-second timeout, set location to “While Using” for most apps, cull your notifications, and enable the 80% charge limit. Ten minutes, once, and most people gain 20–30% more battery life. Your phone was designed to last a full day — these tweaks just stop the software getting in the hardware’s way.
