Battery capacity terrible after repair - stuck at 100 mAh

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.