I have seen all flavor of rechargeable batteries in the NiMh category and some in NiCa. There are regular one use AA/AAA LiIon batteries, but there do not seem to be any standard AA/AAA rechargeable LiIon batteries, nor have I seen any C's or D's. With the increased shelf life and use time of LiIon I find this disparity to be striking. Why do we not yet have a simple rechargeable LiIon replacement for the regular batteries that we use on a daily basis?