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What do you mean Incorrect?

>> but you need to identify the problem first

Apparently apple had identified the problem first and they choose to put non user-replaceable batteries.

Plus why does my 4 years old Oppo android phone is not suffering from this battery issue ? Does apple use inferior batteries ?

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Battery life is somewhat random; it's why batteries as a whole are measured with MTTF. You may be lucky enough to have an outlying battery life, or you may have used the phone in such a way that the battery lived longer, or the battery itself may have had a higher MTTF due to it being a larger capacity.

>> Battery life is somewhat random

Looks pretty deterministic in case of apple. That is until the next phone release.

> Plus why does my 4 years old Oppo android phone is not suffering from this battery issue ?

Slower processor/smaller overall consumption, possibly. Living in a place without temperature extremes (especially cold) helps

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