The dendrites (post #334) happen in a full sized EV battery. Can't say how the power tool batteries are designed or ebike batteries.Correct me if I’m wrong, but the voltage and external charger are more like a power tool in protocol than an auto battery. So unless all these anti EV people are also anti all lithium battery power tools and they refuse to have them around as well, it belongs in a discussion of power tool safety not EV s.
The charger in the OP's fire may have been the correct one, but an amperage over the ebike battery recommendations is risky. No details are given in the OP, though a cheap Chinese charger will go bad and a replacement will be found maybe not compatible with the battery.