So far, so good!

Mijn probleem

The battery or charging software in the iPhone 4s became unreliable. It would drop from 30 percent to zero and shut down. The new battery seems to have ended the problem.

Mijn oplossing

The installation was easy. Other than a couple of minor spooks.

Mijn advies

Fixing the loose part with tweezers was delicate, and if I recall correctly, I needed to consult other sites to be sure of the orientation of that part. And the ribbon cable from the battery seemed slightly misaligned with the connector once the battery was in place. I connected, then placed the battery.