31 year old Lithium battery still functioning

[JFA]

Are there people specialised in rebuilding Ni-Cd at an affordable price ?   There is an outfit near my place rebuilding Pb-acid lift batteries, taking them entirely apart, re-pasting the plates anew, etc. It's much cheaper than having to buy a new lift battery.

[SeanB]

Cylindrical NiCd no, but the larger plate cell types are rebuildable, just like the wet cell lead acid ones. You can even buy Edison batteries or make them yourself, as there are no really toxic materials inside them.

[PointyOintment]

NiCd has no real chemistry failure method, only seals that leak or outer cases that corrode. They have multi decade lifeties in open cell versions ( along with Nickel Iron batteries as well) and are very good in cyclic use in space vehicles. There you have NiCd or silver/silver oxide and nothing else.

Nickel-hydrogen batteries are also used in spacecraft, also due to long cycle life.