Hi Peter,

> Under Apps&notifications/Special App Access I can find a Battery
> optimisation, which for a lot of Apps, says 'battery optimisation not
> available'

I don't think that's relevant to the rapid discharge of your wife's
tablet.

https://github.com/google/battery-historian#readme has a means of
analysing battery usage but only with a device where ‘developer options’
have been enabled AIUI.  I haven't tried it.

-- 
Cheers, Ralph.

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