Lithium-Polymer batteries are often used in cellphones, and other applications where weight is key. Instead of suspending the electrolite in a solvent like LiIo batteries, they are mixed with a polymer, pressed into sheets and laminated onto each other. Because they are constructed of laminated layers, a metal casing isn't needed, so they are much lighter and can be constructed in a variety of odd shapes and sizes. They are also non-flammable.
What is thier charge-discharge cycle time like?.
Do they require a dedicated type of charger?.
Is thier amp-hour rating comparable to what is currently in use?.
Would a fuel-cell be better, in this application?.