I bought this Nyoko one http://www.amazon.com/gp/product/B001IY8CG6 and never looked back. I used to use rechargable NiMh AAs but I got so tired of having to figure out which of my 4 remotes were charged and which weren't, and then having to constantly open the backs, take the batteries out, and then charge them. This solution is much, much simpler.