Rechargeable Battery Box is LEGO set 8878-1. It has a score of 74. This is average compared to all other sets. The set is recommended by 0 reviews, based on 4 scored reviews and 4 reviews total. It is ranked in the bottom 23.5% scored sets on Brick Insights. We know this set was released in 2009, and it is categorised in Power Functions.
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http://shop.lego.com/en-US/Transformer-10V-DC-45517?s=6088028 The transformer link should be in bold across the top and offered as a "people also bought" or "you may need this too" since I just spent two weeks waiting to finally receive my battery just to not be able to plug it in. The battery and transformer ultimately add up to ~$80. I can see it being less expensive if you have more batteries to charge, and only need one charge cord to share. I decided to go this route instead of buying rechargeable AAAs and replacing them all the time. I hope I made the right choice.
Good product. WAY expensive for what it is. Dont forget you still have to buy the charger (Beware. The generic charger kind of "damage" the lego battery. Once you use a generic brand charger, your lego rechargeable battery will never tell you again when its charge is completed).