Leaf range extension project failure

I recently helped remove the usable motor/controller and undamaged components from a burned-out Leaf. The owner had incorporated a range extension battery module in the trunk but water ingress caused a catastrophic failure :(
There is an update to this video at • Leaf Range Extender Fa... - update starts about 1min in

[@1983indy111]

what is easiest way to over charge a 2015 nissan leaf? thanks

[@michaelmcbrideElysium]

Where did you find the burnt up leaf at?

[@mikeatyouttube]

Michael McBride the car had been towed to Sunnyvale Towing, ready to be scrapped. I have no more information on it.