You need very good eyes and bright light

Mon problème

My iPhone 4S battery lasted only a half day.

Ma solution

Most difficult part was to fix the 2 tiny screws on the battery. And attach the micro connector to one of the tiny screws. It fell into the electronics of the iPhone a few times. Fortunately the tip of the tools are magnetic.

Mon conseil

I used a small piece of tape to fix the connectors in place. After tighten the screws I removed them. And keep all contacts clean.