FP changes automatically to battery saving mode, even when the battery is completely charged. Only when connected with a socket it is in standard mode.
My battery does not seem damaged, of in any other way out of order.
All apps function normally. After recharging, I can use my phone for the usual 2 days.
PF and battery bought in 2021, used very carefully. Never had any problems before.
Could you go to the app Settings and then to Battery.
There you can set when and if you want battery saving.
It’s normal behaviour to have the battery saving of during charging.
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Thank you Lidwien, this has solved the problem.