Battery Powered Emergency Mobile Phone Charger, Handy stocking filler for the kids ( an adults )
I have linked this to the Maplins web site but bear in mind P & P charges, better to get it from a local store if you can.
was £6.99 reduced to £2.99, best other price i can see after a very quick search was £4.99
comes in 4 different colours
More information on the website