kje
Newbie level 4
![Newbie level 4](/styles/images/ranks/blevel1.gif)
I want my speakers work with batteries. I opened one of the speakers and found a circuit board and a charging coil. I assume I have to cut the wires between the circuit board and the charging coil, and connect the batteries here. How can I find out how much voltage I need from the batteries to drive the speakers?