I have been busy blowing up some stuff over the weekend, and the last couple of days, after work, as I had loads of old batteries to get rid of before going to the battery recycling center.
Attached are some D-cell Duracells arcing and a SLA 12V7Ah venting at the leads of my 240 / 42 Volts 5kVA transformer.
These experiments are dangerous and basic PPE as safety goggles and a glass barrier are a must !
It is good to make people aware of the dangers of batteries, especially overcharging, with the wrong type of charger as often discussed in some threads.