I have a Sony Infolithium battery on my Sony TRV33 camcorder. It's not the battery that comes with it, it's one of the larger models (forget the model number) but it's a Sony brand. Anyway, it's been working fine but the other day after shooting video for about an hour, there was still about 85% of the battery remaining. The next day when I took the camera out of the bag, I noticed that I must have left the camera on VCR. I figured the camera had an auto-off option but when I checked the battery it said it was at 0%. So, I just plugged it and left it for a very long time. The light went off as if the battery was charged. But when I checked the battery info, it said only 50%. What can I do to get it back working properly? I've had issues with these "smart" batteries before. Even thought they are fully charged they don't recognize that they are.

Thanks in advance.
-Adam