double-oscar
If they had used the better Lithium chemistry LiFePO4 which can not catch fire, instead of Lithium Ion which if anything goes wrong goes into thermal running away.
So bad design and choices in both type of chemistry and not putting them into a fire safe box from the start.. The best would be redesign with LiFePO4s and dump the steel box.
The trend in vehicles and aircraft is for LiFePO4 batteries to replace all forms of batteries.