Chosen Solution

Hey guys, it’s been 2 times i am having this problem. After replacing the upper component cable, (power and volume cable) the battery % percentage of the phone dont refresh. It always shows the same percentage. Do you guys know why ? The last phone i repaired, i may have not put back this small piece :

Have you tried doing a hard rest (hold home and power button until you see the apple logo) and have you tried calibrating the battery (letting die completely and let it charge and seeing if the percentage going to 100%