| | Re: 9900 battery drains while OFF???
I would try a brand new battery and charge it to 100% while you're at work. But don't keep it plugged in all day as you've been doing as I think you've compromised it by being plugged in too much. I had this happen with a laptop battery where I kept it plugged in a LOT, and in doing so the battery had the life drained out of it.
Also, make sure you're using OS 7.1 as it's had a tremendous difference in battery life.