On 12/09/2020 10:41, Ahem A Rivet's Shot wrote:
> 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).
>
NiMh has certainly improved: modern cells will do a year or so


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