The non-removable battery is of the lithium polymer (Li-poly) variety, as opposed to the more frequently used lithium ion.
ENGADGET: Motorola Atrix HD review Mobile
This isn't a new development, especially with Motorola, since the Droid RAZR appears to use the same 1, 780mAh Li-poly power pack.
Sounds great, but there are sacrifices to be made: Li-poly batteries are more expensive, offer less energy density and fewer charge cycles.
Using Li-poly instead of Li-ion is a strategic move: these batteries are more resistant to overcharging and offer a lower likelihood of leakage.
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