…but I might have made the score of the century. £30 the lot. They all boot up happily with 5v power supplied with a couple of Dupont wires and hold at least a little bit of charge. Replacement USB cables and straps ordered, so full testing will need to wait until then.
They’re prpbably all spicy pillows by now, be careful.
I’m sure it’s fiiiiine. But, actually, yeah, good point. If they work properly I’ll look into replacement batteries.