Chosen Solution
Hi, 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? Thanks
It sounds like you probably damaged the filter (FL11) next to the battery connector that allows the battery to communicate the battery conditions to the CPU. This is called the BATTERY_SWI line. See the picture below.
This requires a micro-soldering repair and is not DIY. Ideally, you need to find a micro-solderer to do this.
