How to switch an iPhone battery?

I purchased a replacement battery and it came with a screwdriver for the outer screws. A "pentalobe" screwdriver, I guess is what it's called. But once I got those off, I need to remove one more screw that actually keeps the battery in. Supposedly it is the same screw, but it clearly is not. Has anyone done this before successfully? Does anyone know what screwdriver I need?

You can't

Search on you tube for battery replacement for an i-phone and they will guide you threw it step by step.

The screw holding down the battery cable is a phillips, #00 I think.