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I just looked at my phone and I don't even have the option.
You'll find battery care under settings / Battery/ at bottom of next screen- battery care, tap on battery care and on next screen battery care can be turned on / off from there. There is an issue with battery care some users are experiencing that when charging your XZ phone and your battery care is switched it does not always activate. I have found that if you turn it off then back on again just before plugging your phone in to charge it will then work.
Yep that's where I looked and it's not even there for me. I have teh NA model. I think I might have to flash a different model.