In message
Jax wrote:

I bought a card full of approx forty assorted LR button cells marked
"silver oxide" for a pound (not even two US dollars).

I didn't expect much but to my sheer total astonishment they seemed
to work quite well! So far.

Then I got to thinking that maybe they will leak horribly when
exhausted. So I figured I should see what the designation "LR"
means. As you can see below, I am not much wiser!

Can someone offer some real facts on the difference between LR and SR
button cells. snip

I don't believe that answers relating to major/reputable brands would be
of much relevance to the '40-ish for a pound' Chinese ones from
market-stalls, etc.
I've used them for some years, from cards with various obscure makers'
names and a motley collection of sizes and type-designations, but have
always taken the word 'silver' (or an SR or AG prefix) 'with a pinch of
salt'.

That said, they're certainly good value for money: occasional cells
'dead on arrival' (and with external corrosion) apart, they've lasted
pretty well and have never later leaked.
Certainly, IMO, fine for anything but an expensive analogue watch which
one doesn't wish to take the back off more frequently than essential
(risk of dust/dirt) ...

--
Peter Duck