Canon PowerShot A400 Digital Camera "double square number" Questions

...double screen also a square with a circle in it then two more circles and another small square that looks like a house on the bottom it says set a nd a sqiggly line pon the left biottom it has the ...

...square over the batteries and closed the cover. I found that I could take more shots without the camera saying Battery Empty. See if this works. So far it's touchy but it's been taking more photos ...

...number don't double like you would expect, and the smaller numbers allow more light (you'd think it was the other way around) - but it's because we're talking about a circular lenses ...