Really excited about my new 900 mah bat. Pulled it off the charger at 3:00 am yesterday, and just now had to go to my backup. I use my EGO mid to heavy, depending what I'm doing, but have hit the hell out of the 900. Thats about 32 hours on 1 bat, less a few hours for sleep. Thats killer. Gotta order more of theese...