FMurtz wrote:
Maybe pinch a tesla and use its batteries?

That's actually quite sensible. Anyone want to do a group buy:
https://www.ebay.co.uk/itm/Panasonic...s/302659762579
https://www.ebay.co.uk/itm/Panasonic...s/302659762202

Tesla cells are top-quality Panasonic NCR18650B 3200mAh.

Theo