Battery life is a key issue for smartphones – and it’s an area where the Palm Pre with its removable battery has some definite advantages over Apple’s iPhone.

Not least that Innocell is developing a new battery for the Pre that has twice the capacity of the handset’s original.

It currently offers the Innocell 1350mAh Extended Life Battery, which promises longer standby and talk time than the original fits in the existing space (so no replacement door is needed) and costs USD $44.95.

With its non-replaceable battery this is an option not open to the iPhone.

Innocell is also developing an extended battery that the company claims will provide up to nearly twice the capacity of the standard battery.

This will include a rubberized battery door to accommodate the slightly bigger size.

Price and availability has yet to be announced for this battery.

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