Battery low, but you don't have a charger with you? You can use a compatible USB cable to connect to a compatible device, such as a computer.
To avoid breaking the charger connector, be careful when connecting or disconnecting the charger cable.
Charging over USB can take longer to start, and may not work if you connect through a non-powered USB hub. Your device charges more quickly when connected to a wall outlet.
If connected to a computer, you can synchronise your device while charging.
See Charge the battery.