Most of the time Lithium-ion polymer is also in a hard case, so you don't bend it.
The Pandora has a Lithium-ion polymer battery without a hard case, so you can fit more battery capacity for the space.
The Pandora requires a battery installed to turn on IIRC. Even if it is dead or wont hold ANY charge, you still need it. I think it needs to just complete the circuit. Same for most cell phones.
edit: hopefully in 20 years OP will have already released the specs so we can custom order our own batteries, like a group buy. but will you seriously be using the pandora in 20 years?
what were you guys using 10 years ago?
Edited by WhiteBat, 02 February 2010 - 05:11 AM.