Originally Posted by
PhotoGreg
Wait a tic.. You can use 2S Lipo's with the 120a 1s Speedo's? Just put the heatsync and fan on it?
The "1s" ESC is actually a 1s-2s, and the standard 2s ESC is a 2s-3s
The big difference, at least for the Hobbywing, is that the 1s-2s has built-in BEC booster, while the 2s-3s doesn't have that (it works on 1S, but the BEC output is the same value than the battery output, so 4.2V max, that's why you need a BEC Booster to increase the value up to 5V or 6V).
If you think that you may run 1s car sometimes, you can go for the 1s-2s ESC.
If you are sure to run 2s only (or sometimes 3s), the 1s is not necessary.