I-SOBOT is powered with 3 NiMH batteries, size AAA HR03.
3 Eneloop 800mAh NiMH batteries are included in the pack but it works also well with other NiMH batteries.
The manual warns not to use non rechargeable batteries like alkaline because voltage may be too high: >1.5V for alkaline, 1.2V for NiMH.
Also NiMH batteries can draw high current and it is necessary for the 17 servos. I have noticed that not all servos move at the same time in complex motions: so far I don't know if this is due to a limitation of the current draw or of the controller. Anyway, this is a limitation I would like to remove to generate nice and fluid movements.
Let's remove the battery holder (it is fixed to the body with 2 screws):
Don't do any disassembly by yourself if you are not sure to be able to reassemble the parts. These operations void guarantee.
On the next picture, you can see the battery holder 3.6V single output and a protection on its back (probably short-circuit or fuse):
I tried to remove the front cover with the upper 4 screws but something at the bottom prevents removing it. However, there is nothing interesting except the speeaker as far as I could see.
The battery cable goes through the body to power the controller in the back:
Let's see the controler side and the good news.