The battery management systems in most personal e-mobility devices use outdated approaches for preventing thermal runaway, they're implemented inadequately, the

The battery management systems in most personal e-mobility devices use outdated approaches for preventing thermal runaway, they're implemented inadequately, they don't try to predict it or they use outdated methods, and they lack mitigations for when it does happen. Small-time companies spare the expense of doing a proper job and accept the risk.