Neither does **** on a nun but,,, . My bike will turn the starter with the ecu removed from the bike and VOLTS very low but AMPS must be close to 40 or it will not move correctly , if voltage gets low enough, the relays, which require tiny amounts of amps but at least 9 VOLTS won't click and put juice to the starter. The ecu is programmed not to run the fuel pump if the VOLTAGE is below 9.5 VOLTS at key turn. Some batteries are made of 6 cells at 2 VOLTS and a shovel full of AMPS per cell. Some batteries are 4 cells at 3 VOLTS per cell and a shovel full of amps. So ,,, if 1 cell ain't contributin, it CAN stop the fun. Still not sayin it applies to all bikes, it's just a possibility. I hope this helps.