I want to get an iphone portable battery as a present for someone. Anyone got any recommendations? It just needs to be cheap and cheerful for emergencies, something like this:
http://www.ebay.co.uk/itm/External-Portable-Emergency-Battery-Charger-iPhone-4-4G-4S-1-Year-Warranty-/320771545731?pt=LH_DefaultDomain_3&hash=item4aaf795a83#ht_2540wt_1270
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