I had one go in my car when I was a wee squirt. Not fun.
i used to work for a bad boy dealer, they sold the MTV utility vehicle, which was available with either a 400cc TGB gas engine, or they had a 48v electric version. The EV had eight, 6 volt batteries. 4 under the seat, 2 behind the seat, and 2 in front under a little access panel barely big enough to get one battery through it. They were JUNK, the entire machine.
--anyway--
customer brings one in, says "it's very weak". We were not set up to work on EV's so no tools, other than our own DVOM. Ideally need a code reader for the MCU, and at the very least a battery discharger to test the battery pack condition. So I got this MTV-E in the shop, checked the battery water-it was ok. Pack voltage 50.1v, little low but acceptable. Checks out fine. Since I didn't have a discharge unit, I just jump on it and go drive around a while. Across the parking lot a few times, then went back around the front of the building again, made one turn and ka-boom. All 4 batteries under the seat exploded at once. Blowed the seat completely off with me on it. Head hit the roll bar, tore the roof off, acid burns on my head (lost a lot of my hair), down my back, shoulders, chest, lots of bruising, destroyed the machine in most of its entirety, ate up the parking lot, you get the idea. I was thrown about 15 foot, and ended up on my side within a foot of a major highway. The fire department showed up about 10 minutes later. 6 businesses within the area had reported an explosion sound, and the bigger of them across the highway actually had some window damage from the concussion.
So yes, I have a reluctance to repairing electric vehicles in general because of that deal.