I'd be conscious about the LIPO battery choice & potential fire risk.

They're absolutely fine when treated with care (i've had many for years for RC planes & helis and never had more than minor issues), but i'd be concerned people are used to not having to care about their batteries.

If you discharge them below ~ 1.1v per cell (higher for cheaper ones) they don't quite explode but it's not a slow burn either: http://www.youtube.com/watch?v=hcwOwf55Rtc

There are other options like li-ion or, slightly lower voltage per cell but you can pretty much abuse them and they won't blow up: A-123's.

EDIT: for clarity, discharging to 1v alone shouldn't cause a fire, it's the act of charging them from that state.