Isn't it illegal to manufacture and sell a rechargeable Lithium battery that is the same size and same connections but different voltage as a Ni-MH battery? That is why there are no lithium rechargeable AAA and AA size batteries.
Tenergy batteries for RC airplanes are cheap Chinese ones sold only by HobbyKing. I did not know that the Chinese factory has an office in California.
Some of these 9V Lithium rechargeable batteries have a "protection" circuit board that limits charge and discharge voltage and current but others don't. But the specification says they all must be tested the same which is completely WRONG!
That is why there are no lithium rechargeable AAA and AA size batteries.