Two Magic Mouses, same batteries, different charge percentage

I noticed an annoying issue with a Magic Mouse: it shows a very low charge level of the batteries inside, and it's not just a visualization problem because it actually turns off when the level goes under 20% or so.
The problem is related to this particular Magic Mouse because I tried to put the same battery pack into another Magic Mouse, and this one showed me 100% of battery charge, while the previous one showed 52%.
I tried also to repeat the test with another battery pack, again the faulty Magic Mouse shows 29%, while the other one 99%.
Which could be the cause?

One of the two mice has a faulty charge indicator.   It could be either but I suspect the one which turns off at 20%.  Mark which batteries are which and go into a professional store that have the facilities (Maplins in the UK) and ask them to do a reading.   You can buy a battery charge reader for a few pounds for future use.

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