Hello I would like to connect my K75RT via the on-board socket to the maintenance charge. Question: can the increased voltage (m.W. over 14 volts) damage the on-board electrics? Is the on-board socket secure, if yes, how high? The charger that should be used is a Einhell CC-BC 4M. It is supposed to switch after charging to maintenance charge and recognize the battery type itself. It charges with 2 resp. 4 amperes. Is that too much? I have a Gelakku. Thank you for E your answers. Thorsten