I have recently purchased 2 of these battery packs, and have them wired together for 12 volt system. The charger ( 6V - 12V NiMH / NiCd Smart Charger Product Code: RB-Ten-02 ) charges them both as a 12 volt 10 cell pack, fast charge & really good runtime. I’m pulling 6 volt from the negative and bridge between the batteries to run my Arduino boards & sensors, along with 12 volt motors.
T
Tarek
practical and a decent quality
perfect for your humanoid or any other robotics applications