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Also, when I store my batteries, I keep the in the same direction. All th positive sides in one direction and the negative in the other. EZ Scooter Repair Shop, North Las Vegas, NV

The problem is the PVC overing on the battery. When connecting batteries in series, you go positive to negative by changing the direction of the battery banks until you get the desired voltage. Vibration can cause the battery PVC coverings to rub against eachother, expose their negative walls...

The cause of these fires is simple. The Max Continuous Discharge Current of the BMS is too high for the type of cell used to make the battery and the BMS does not have a high temperature sensor. Lithium batteries have a safe operational temperature between 0 degrees and 140 degrees. Normal Cell...

http://www.ezscooternv.com/Build-It-Yourself_Lithium_Battery.html

I have been converting Lee Iacocca eBikes to lithium for several years at my shop. It is easy. Just decide upon how much you want to spend for Ah. Next, be very careful opening the battery box. Do not use power tools. Third, use a BMS that does not exceed the amps that your motor can handle...