On Sat, 12 Sep 2020 09:09:06 -0000 (UTC)
Martin Gregorie  wrote:

> I should have popped the battery holder out before I wrote that: my HP-21
> is actually running on Maplins Hybrid AAA cells.
>
> I don't know the exact chemistry, but its possibly a riff on NiMH.
>
> Its certainly not NiMH as we used to know it because it holds charge at
> least as well as NiCD did, while NiMH was famous for self-discharge:

 There is a low self-discharge variant of NiMH with slightly lower
capacity and rated retention of around 80% over a year. In the shops they
get advertised as pre-charged or similar. I've been using them long enough
to wear some of them out (it took several years).

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