Thanks for the responses.
Tony: Yes, the problem could be that the battery is not of the highest quality
, but I'm guessing that would cause it not to hold a charge as long as it should. Can't see how that would lead to not charging fully...
Dustin: Tried the multiple bumps. Didn't help.
ctw: "Also, are you charging it beyond when the light indicates a full charge..." Tried that as well, and it didn't help.
"Have you tried draining the battery to a low level and then charging it completely with the power off? That should work to re-calibrate the battery bar." That's the one thing I haven't tried yet. I'll do it today and see if it makes a difference