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[ubergrafik]

Hi - so I have quite a few G4's still, and am wanting to replace the ones that have dead BIOS batteries. They all have TADIRAN TR-2150 lithium batteries in them. I don't necessarily have to replace them with the exact type (although, I do like the little grapes:)) - I guess the advantage of them is that some of them are STILL working after 20 years! Presumably they aren't rechargeables...

What do people recommend?

[robespierre]

Saft LS14250 are equivalent.
Note that the used cells contain toxic waste and should be disposed accordingly.

[ubergrafik]

Thanks! Yes, will recycle the old ones properly:)

[peeperpc]

There are many. This type of battery is under a standard called ER14250.
Here is a list of some of them:

Tadiran TLL-5902, TL-5902, TL-5151, TL-4902, TL-5101, TL-5111

Saft LS-14250

Sonnenschein SL-350, SL-750, SL-150

Maxell ER3

Minamoto ER14250

I can't find info about Tabiran TR-2150. So it's probably TL-2150, which is the same model that came stock with my MDD since 2003 and is still alive. I've used a few brands but always come back to Tadiran because, IME, they last the longest. I see people say Varta is even better but I haven't tried it.

From this page: https://tadiranbat.com/technical-data/discontinued-products/, the TL-2150 has been discontinued. Its direct replacement is TLL-5902. I can't find TLL-5902 in my region, only TL-5902. So, in my case, the TL-5902 would be the replacement for it. Its datasheet also looks good, even better than the TLL-5902. So it should be OK.