May 06, 2021 · Using Arduino Motors, Mechanics, Power and CNC. jbarth200 July 20, 2019, 5:21am #1. Hi, I recently purchased a few DS3218mg servo motors, I have used smaller servos in the past. I am trying to power it with a lith-ion battery. datasheet shows 4.8V to 7.2V In with a stall current of 1.8A at 6.8V, The battery is rated 7.4V 2200mAh.