Although the little battery meter on all Windows Phone 7 devices gives you a rough idea of remaining juice, if it's one thing Windows Mobile users of past want it's 1% battery readings (we're a finicky bunch, aren't we?)
Luckily on the Samsung Focus there is a way to find out the exact battery level. While not the easiest method, it's far from hard either. As I demonstrate in the video above, you can simply enter the diagnostic menu (Dialer --> ##634# and select “Call“) then enter in *#2*# to reveal the battery level. The next time you want to check, just run the "Diagnosis" program in your program menu list and dial in *#2*# for easier reference.
Check out the video to see it in action.