Chosen Solution
I replaced a charging port on an iPhone 5S (the owner said it was not charging properly after they dropped it in dirt and they cleaned it out- it looked pretty rough in the port). I tried to charge it before replacement and it did not charge. It started charging after I replaced the charging port but after getting to 4% quickly it dropped down quickly and died. I had it on a good (apple brand) charger all night and it only got to 17% and is now back down to 13%. What’s going on?
80% chance damaged IC. Check the IC’s around the battery connector and see if you see any that are broken. Also check for water damage. If I were a betting man, I’d bet the phone has been wet before and one or more of the IC’s are corroded. 10% phone needs to be reset in iTunes. This is the easiest thing to check but one of the least likely causes. 10% bad battery. Bad parts do happen. If it were me, I’d put in under the scope and check the board for corrosion and/or bad IC’s.
