My Tungsten E2 is not charging.

I had symptoms with my Tungsten E2 where the charging icon would show up when the charger was connected, however, it didn't seem to charge, because when it was removed from the charger hours later, it would still show the same percentage of charge (as read by touching the battery icon while in the favorites screen).
Tried resetting the unit, reconnecting multiple times, different charge cables, and it was always the same.
I thought it might be time for a new battery, so to check it out, I got my T-5 Torx driver, removed the four case screws, and carefully pried open the case from the top (the bottom has hooks that have to be disengaged by sliding the case half downwards after they're separated from the top)
Measured the battery and it seemed to be okay, and after unplugging the battery connector and reconnecting it, it worked normally again. Charged quickly back up to 100%, and the battery is fine.
It looks like something may get out of sync with the battery charge circuit, and by simply unplugging the battery to allow it to reset, it restored operation, no replacement battery needed.