Is this a bit dodgy with a charger?

[Avocet]

I would judge them perfectly able up to pass 5amps at least, but the point is - with fault current passing those thin wires the PVC insulation will likely catch fire, setting fire to anything in the area. A fuse is designed to safely rupture, with nothing combustible near it, contained in a metal/glass metal/ceramic sleeve.

I admire your calm and well-reasoned responses in the face of adversity. I really do!