I too have 2 battery screws. My battery is longer than the one pictured. I think my battery must be an extended capacity battery.

What I do not understand is that in the picture, on the extreme right - next to the computer's outside edge, there is a round CMOS battery pictured with a red/black twisted pair of wires plugging into the motherboard. My machine has an empty space with no battery. What about the machines of others? Was there one that has been removed? My machine seems to work ok without it. Should I install one?