GEAR4, formerly PodGear, has announced the PocketPower, a reserve power pack for all iPod's and any other USB device that promises an additional 8 hours of playtime to your iPod.

The PocketPower comes complete with four AAA rechargeable batteries that can be charged via the USB on your computer, and then at the flick of a switch, they can provide power for your iPod or any other USB device.

The PocketPower has the added advantage of being able to charge any electronic device with a USB charger slot.

GEAR4 believe the use of AAA batteries in the PocketPower means that it is more flexible than other lithium ion battery back-ups available on the market.

It also means that if you don't have access to a USB power source to charge up the PocketPower, you will be able to charge your iPod or phone just from normal AAA batteries.

The PocketPower comes complete with 4 x AAA rechargeable batteries and male to male USB cable. It will cost £19.99.