I have a Logitech combo, but I've NOT installed the software; the LED on the top of my mouse flashes yellow when my batteries are low and the keyboard has a 'fuel' gauge. Your Microsoft products may have something similar.
Yes, I can imagine that your board and ball work OK without SetPoint. But here, using the unifying software for both keyboard and mouse - with or w/o SetPoint - it bogs down W7 for a few minutes after boot, and hangs briefly at shutdown. There are numerous other problems, but this isn't a Logitech forum, so we'll leave it at that.
There is no battery indicator on this MS wireless Intellimouse Explorer 2.0.