The new Mophie Juice Pack rechargeable lithium polymer battery comes in a wrap-around, non-slip, case in which you insert your iPhone. With it, your iPhone can have up to 250 hours of extra standby time or up to 24 hours extra audio playback or up to eight hours extra talk time or up to seven hours of extra video time or up to six hours of extra Internet use.
The Juice Pack, which can be charged separately with the iPhone adaptor or any iPod connector and features a 4-LED battery status indicator. You just press the test button to see how much power you have left.
Priced at the equivalent of £50, it is available to UK customers.
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