I have a robotic arm that uses about eight 7.4 volt volt high torque servos. (https://www.servocity.com/2000-series-dual-mode-servo-25-2/)
I need to know what Kind of battery system I can use to power the claw servos, and what servo controllers are available for such a heavy duty servo type.
BATTERY OPTIONS: I cant use lead acid, because my robot cant fit such a massive battery on it. Li-ion I'm not sure would work, because each cell is 3.7v, and the max amp-hours for a typical battery cell is 5Ah so the battery pack for All the servos would be 2 li-ion batteries, and 10Ah, which would very quickly drain the cells.
I'm guessing my best option would be to make a NiCd D-cell battery pack, resulting in 5 NiCd batteries 1.2v each and 25Ah.
SERVO CONTROLLER: I am not sure what servo controllers are the best for controlling 7v servos. I have one that can control small 5v servos, but I dont know if it could handle the heavy duty servos that are on my claw.