My Incredible 2, seems to be having it's reoccurring nightmare that I've had with my previously replace Incredible 2s. My phone dies quickly, and when it's placed on the charger it will hold the charge, (not increase charge), or decrease charge down to 1% or 0%. Or, as the phone slowly charges up, phone usage will cause the charge to decrease even if it's on the charger. The only solution is letting the phone charge with out using it.
I've had this problem numerous times. Usually I just get the phone replaced. Howeer, the last time it happened, the problem went away on its on. This was of course after trying different wall adapters and usb's. I did find that when I used the HTC specified wall adapter (long rectangular plug) my phone seemed to charge. I am not exactly sure what the problem is, but out of laziness I will continue to not use my phone while it's slowly charging, until it becomes unbareable.