We've all been there: you've got an important call to answer, or a couple more levels to the end of a game, but your smartphone's battery just won't last. But don't worry... here are 10 ways to avoid the problem.
That big screen is your battery's worst nightmare. Minimise the power it drains by using the automatic or adaptive brightness feature in your display settings, or turn down the brightness manually to as low as you can tolerate.
1. Keep your screen's brightness as low as possible
Unless you're actively using them, keep your wireless connections turned off. The only exception to this rule is when you use location services like maps. Instead of only using GPS, turn on Wi-Fi as well to boost your signal and use less power.
2. Turn off Wi-Fi, GPS and Bluetooth when you don't need them
Some apps use lots of power. To stop them draining your battery once you've finished using them, manage what you have open with your multi-tasking screen.
3. Close background apps and use fewer widgets
To save even more power, delete home screen widgets (such as Twitter and weather feeds) and use their corresponding apps only when you need them.
When you're somewhere with poor or no signal, your smartphone constantly searches for a better connection. If you're going to be there for a long time, turn on flight mode until you leave.
4. Use flight mode when you don't have signal
Turn off alerts in your smartphone's app settings or notification centre to save battery life.
5. Turn off notifications and vibrations
For calls, texts, and notifications you actually want, you can save even more battery life by turning off vibrate and using a ringtone.
When you update your Android's operating system to 6.0 Marshmallow or 7.0 Nougat (if your smartphone can run them) you get the Doze feature. It automatically saves much more battery when your smartphone is locked and not moving. So it's well worth updating if you can.
6. Use Doze if you have an Android phone
Charging your battery overnight can actually reduce its lifespan, so charge it in bursts throughout the day instead. Then, once a month, charge it to 100% to refresh the battery.
7. Keep your battery between 20% and 80% charged
It's usually best to use the charger that came with your smartphone, but some third-party chargers work well and even charge your battery faster. Just make sure you don't buy a cheap knockoff as these can do permanent damage.
There are lots of free apps that claim to help you manage your smartphone's performance and increase your battery life, but only some of them are worth having.
8. Download free apps that optimise your battery life
Check out Greenify for Android, Battery+ for Windows, Battery Booster for Blackberry, and Battery Doctor for iPhone.