[kibwen]

While the potential for fires shouldn't be dismissed, for batteries designed to be stationary rather than mobile (such as in an e-bike), you can use a chemistry optimized for stability rather than optimizing for compact weight and size.

[vvbull]

It's not the batteries that are the concern. It's skipping the fuse box.

[toast0]

UK has ring mains, so appliances have fused plugs to protect the mains wires from being overloaded.