Do not cut sheet steel or use a grinder if you have a battery on charge in the vicinity, lots of grinder sparks, that 1 metre cut is nearly finished when BOOM! bits of battery hit you in the back of the head, and battery acid is running down the back of your neck...
Hydrogen from the battery charging process and grinder sparks do not go well together...
A lesson already known, but forgot it was there on charge... won't forget that one again!
Rob.
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