Check out these android 4 tablet images:
Lenovo Android A1 tablet with Navdroid GPS app
Image by lpycycles
I bought this tablet as an alternative to an all out bicycle GPS. It fits perfectly in the handlebar bag, the battery lasts about 4-5 hours with the GPS and screen on constantly, I’m not sure how that compares with other devices but it’s pretty good for what I am using it for.