I usually charge it at the office for a few hours. I was told by a RIM rep that you get the full life of the battery when you use it until its low then charge it for 4 hours. It works well for me. sometimes i dont charge it for 2 days if im not using yak-on.
Here's something to note: if you charge via your wall charger, there are times when you'll see that the battery is only 95% charged. If you charge via your USB through your computer, it will read 100%. It's a little glitch but trust that either way, you're fully charged.
Your Neighborhood PR Guy Blackberry 8703e (Verizon)
"There's a time for compromise...it's called later".