I have learned that it’s possible to ( often ) bring Lithium Ion Segway batteries back to life, by sending them off to certain companies and paying about £200.
I just spoke to a chap who does it. Apparently the Segway batteries are encoded and you need sophisticated kit to ‘ break the codes’ and reset them, but that’s what they do. This fella ( Welsh guy ) is currently building a seated ‘Segway copy ‘ for a friend who has MS … so he’s a good bloke!

Well that’s cheaper than replacing them altogether!

Except they are in Portugal and I’m back in London.
And no, I don’t think anyone is going to go to my apartment, turn the Segway over for me, remove the batteries and then send them off for me, and then go back and put them back under the Segway.

Logistics!