Yep, I did something veeeery disastrous!!!!
The cells are 1,2Volts so 14,4Volts total, and the ESC is supposed to work till 16,8Volts!
It was plugged properly...because it was pre-plugged by the factory!!! All I did was to the connectors, and soldering were fine! Batteries and cables were not hot at all...I really don't understand...I found the same ESC on rcplanet.com but I don't want to melt also this one!!!
