HTC Incredible :: Battery No Longer Charging Past @40%

I'd love some input from anyone before I take my Incredible in for service, please.Three days ago I realized that the charging light was remaining yellow long beyond the phone's usual charge time. Even after leaving it plugged in overnight, the next morning I was still at less than half charge, going only by the Settings>About Phone>Battery>Battery Level graphical display. Last night same thing, whether the phone was on or off, still a yellow charge light. Today for the first time since I got the phone, the battery indicator itself turned yellow towards the end of the day.Preemptive facts:Prior to starting a new thread, I did a thorough search and found nothing related to this specific battery issue.I have the OEM, red, HTC battery, and have never charged it outside of the phone, or with any charging cable other than the one supplied with the phone.When I first received the phone, I charged it fully, unplugged, and bumped charged before turning it on. For about a week afterward I would charge to green while on, unplug, turn off, and "bump charge". I have never had trouble getting through the day on a single charge, and no, I don't think I was training a lithium ion battery, I believed I may have been training the software of the phone itself.I have tried charging the phone fully both on and off, and have not seen green for over two days. This includes continuous charging for over 10 hours.I have had the phone for roughly seven weeks.The phone does charge- just now I have gone from @25% (as measured on the aforementioned graphical display) to @40%, but at that point it seems to no longer charge, although the "Battery State" says "Charging AC" and the little battery icon shows the charging animation.Have I got a dead battery, or am I missing something? Any thoughts would be appreciated. Thank you.