Ten external battery packs

Proporta TurboCharger Pocket Power

They don't get much smaller than this one. Proporta's little charger here is so diddy, it'll slide into wallets like a business card, turning purses into portable power units and baffling friends when you pull out the integrated micro USB cord to power your phone.

The capacity is low but its portability makes this gadget ideal for snack-sized boosts to blowers when they start to feel the hunger. There are three small LEDs next to the input to indicate charging status. It's a bit basic but super cheap - excellent stocking filler, in other words. As the only one here that you could take out without noticing, the Proporta's convenience is unparalleled.

Scosche GoBAT II

This gloss-black fingerprint magnet may not have the sexiest of designs, but the unit does feature two charging outputs. It comes supplied with a micro USB cable and small adaptor for those with Galaxy Tabs, while four LEDs can be found on the top to indicate the amount of battery remaining.

It's a simple design that feels a tad fragile and the glossy casing is offputting. However, the capacity and dual-charging capability makes the GoBatII almost unbeatable in terms of value. It charges fairly quickly too. ®