This will probably read a bit disjointed and only has a slight connection with DIY apart from the fact that the people involved require shooting and I would quite happily do it myself.
My elderly parents, in their 90s, had a bath lift for my mum. Basically a large webbing strap that fits in the bath and you sit on it and it lowers you down and then up again to lift you out. Nothing complicated, a battery, gear box and fixings.
Any way after 5 years the rechargeable battery had started to fail, no big problem, just get it replaced. They called in a company from the local paper to look at it for them and were told that the battery was no longer available and they would require a new unit fitting.
MMMMMMMMMMMmmmmmmm I've never seen the battery pack but would assume a sealed lead acid, Yuasa or similar from my fathers description.
Today the "nice" man came and fitted it, he would not take the old unit away for disposal on hygiene grounds! No big problem, but interesting all the same, at least it will give me chance to examine the "unavailable" battery pack.
Bearing in mind that my work involves batteries, wires and electronic type things I asked my dad why he hadn't asked me to look at it for him, "we didn't like to bother you" AGGGGHHHHHHHHHHhh!!
The cost of the replacement unit, bearing in mind it was only a faulty battery was £1500:00
As you may have noticed, I'm not amused.
Rant over, I feel much better now.
No actually I don't.................