Stevie, your mates magic boxes start at just over £100 on e-bay. Look for "oxygen hydrogen flame genorator"
Is your street devoid of cars during the day so they all come back with empty batteries at night? If they are all out during the day are they driving about all the time and not able to be parked at a place of work, carpark, etc?
Would any other car that has ruptured it's fuel tank and burnt out not look much the same, I'm assuming one with lightweight aluminium and composite construction ( to counter the battery weight) so there is no steel shell to survive the fire?
Edited By JasonB on 21/11/2020 07:48:57