New battery, charge level jumps from 90 to 1%
I’ve just followed your guide for battery substitution (great!)
It worked fine.
But now I’ve reassembled and rebooted the iPhone jumps from 1% to 90 (and so on, to 80%, then 20...)
Is there a way to check if it’s a battery problem, software (before replacing the battery just lasted 3 hours, without those jumps!) or if it something physical I can fix reopening the device?
And what should I see to compare the quality of batteries in commerce?
Is this a good question?