Chosen Solution
I did a bit of an overhaul on my iPhone 5s, replacing the lighting adapter and accompaniment, then a few days later replacing the front facing camera/prix sensor cable and battery. Upon startup after the second set of replacement parts the phone seemed to work fine, but discharged amazingly quickly. I used Battery Life app to check the capacity and it was showing 100 mAh where it should have been 1550. Ok I thought, must be defective, I’ll put the old one back in for now. I swap them back and lo and behold, the old battery is also showing 100 mAh and discharging super quick. So: coincidence? Did I cause a short somewhere? Software issue? Is it worth trying another battery replacement or is it just time to retire the phone and upgrade.
Might be hard to explain but one time I was changing the charging port on a 5s and with the new part the battery life seemed to drain quickly, wouldn’t have much of a charge and wouldn’t charge. I forgot what app I used but it showed the capacity being at around 100 mAh as well. Tried another part and the same thing happened. Come to find out that close to the battery plug, there are some either some capacitors or resistors and they can be easily broken off when unplugging the battery. If I remember right, there is a capacitor there called the FL 11 that is responsible for the charging and status of the battery life. I accidentally broke it off and it had to be microsoldered back on. Check around the plug and see if you see some very tiny shiny objects close to it and see if one isn’t broken off. This might not help but it sounds close to what happened to me.
Have you used a multi-meter to measure voltage at battery FPC Connector? See if it is truly sending the 3.8 to 4 volts to battery connection. If it is, then I would try different battery… if it is, it may be charging IC… Repost results and we can go from there… Good Luck!
Have you found the solution? I have the same problem on the iPhone 6 .
