I completely forgot about this charger I have that I used to charge the batteries for my Edge 540:
Will it work for charging the 120 batteries? It should. Because of the way the plugs are set up on this charger, I would either have to get an adapter that parallels the 1 cell output into 4 connectors, which would only give me .5 amps of charging power if charging 4 batteries at a time (because each charging output maxes out at 2 amps), or I would have to adapt the 2, 3, and 4 cell outputs to a 1 cell output, then I would have 2 amps available for each of the 4 outputs. Do any of you know where I could get the adapters I need? I suppose it wouldn't be difficult to make the adapters either, I'd just have to pick up a 2, 3, and 4 cell plug and wire it for 1 cell, then put a 1 cell connector on the other end. I'd just have to find out where to buy the plugs and the pins that go in them.