Hey, gmouchawar did your charger have a Thermal Switch? I currently have 2 e-bikes and have manged to do the 6 batterry 36V 7ah solution and am enjoying one if the bikes. The thing is both of them have a non-IC charger and as per the manufacturers instructions these should have an "external thermal switch". Both chargers had such switch. The thing is while preparing the first set of batterries and palcing them into the charger the so called thermal switch somehow managed to touch one of the positive connectors on one of the batterries, even though I did it all with insulated connectors. It created a spark and one of the welded wires from the Thermal Switch got seperated. I tried welding but it lost a connector it had to weld the cable back to it. Have taken it to several places and have not been successfurl I imagine these are used to stop the flow of current from the charger to the batterries if it gets hot. Would the 36V solution work without the use of such switch? How much of a risk do you think it would be not to use it if the batterries charge? Any help or suggestions would be gladly appreciated.