Why do some Android devices (Samsung) show battery charge in steps of 10% whereas others (HTC) show more accurate percentage?
I don't believe this is a hardware limitation, but just the way the phone's manufacturer chose to implement the battery reporting code.  My Droid 2 also only showed by 10% increments.  However, on my current setup I'm using the Circle Battery Widget available on the Market and it displays the percentage in 1% increments.