http://www.blackberryforums.com/show...hlight=lithium
http://www.blackberryforums.com/show...hlight=lithium
The initial charge should sit overnight, in my opinion. Give it 10 hours or so. It won't top-up past a breaking point. Mark suggests fully discharging it atleast once, although I do disagree with that. Li-on batteries are designed to last, and discharging them will hurt their lifespan. They are not like cheaper batteries (NiMH, etc).
The opinion on a Li-on battery will vary from person to person, so go look at both of those threads for the best information you'll find on here concerning the charging and conditioning of the battery. The way I look at it is that you're battery is going to last longer than you will have the phone, most likely.