On Thu, 19 Nov 2020 17:02:11 -0000, "Mark" wrote:

snip

I believe that to be the case on at least some of the Makita batteries
in that there is an external connection to the thermistor in the
battery that *could* be read by both the charger and / or tool.


The Lidl battery I bought had the BMS board in the battery housing

That is fairly typical for a Lithium.

which was
good, but the size of it meant I could not get it in the old NiCd battery
housing so had to make an adaptor
https://imgbox.com/sPWaIlpZ

Sorry, what are we looking at there Mark? Is that the Lidl Lithium
battery with the top cover off?

Cheers, T i m