If your smartphone’s battery life leaves a lot to be desired, here are some quick and easy fixes you can try.
1) Put the phone into power saving mode.
Most phones have a low-power or power-saving mode you can activate manually (see the Quick Settings panel on many Apple devices, or the Battery section in the Settings app on Android devices). This turns off the always-on display and limits your CPU speed and brightness to save battery, but still lets you use apps and other features as normal. You can also turn off the raise-to-wake and ambient display functions if you're not using them, which will further reduce screen battery draw.
2) Close apps that you don’t use often.
Smartphones track your location constantly, using GPS, Wi-Fi, and cell towers to find where you are. But if you don't need to know where you are, turn off this feature in the Location Services section of your iPhone settings or Android Device Manager. Then, if you have the latest versions of iOS and Android, you can let the OS's battery-saving Adaptive Battery and Adaptive Brightness features learn your usage patterns so they only pull power from your screen and apps when you need them.
3) Turn off Bluetooth and Wi-Fi when not in use.
Keeping Bluetooth and Wi-Fi active uses up battery, especially if they're constantly pinging your cellular provider for updates or streaming music and videos. To limit this drain, go to Settings, then Bluetooth and Wi-Fi, and turn off unless you're using them for hands-free calling or wireless audio. Also, set the screen timeout to the minimum amount to keep your phone from waking up for no reason.
