I have some cartridges for groups to play with that last about 2 - 3 hours.
Using HTC Desire's with an extended battery this was possible, until... the option to chosse a black background dissapeared with the last whereyougo update.
A white background eats the battery-life much faster than the black one.
Do you intend to bring back the option to change the background colors in whereyougo?
It would make me a (and probably many others) happy as batteries really last much longer with that option!