This Duracell portable battery charger provides an invaluable power boost to your mobile when you're away from a mains socket, giving you up to an extra 5 hours of talk time.
The charger uses a lithium-ion battery and is compatible with a range of micro USB and mini USB compatible devices including mobile phones, MP3 players and eReaders. (Please note that Apple products and some others may require a separate cable).
Simply recharge the charger from a standard wall socket or from your computer's USB socket to keep power available in your pocket whenever you need it.
With battery chargers like this, there's no need for carrying around spare batteries anymore.