I bought the screwdriver because he had the new LI-batteries. A complete full charge of the battery takes about 30 minutes (less likely) by cooling the batteries are not warm, which increases the life ... The batteries reach their full capacity after three to four charging cycles. What I like is the battery indicator on the battery. For Achrauber, is great in the hand, has for the normal hobby craftsmen enough strength and endurance ... I built so that a wooden shelter for firewood, 150 screws 6x70 screwed without pre-drilling without any problems. The screwdriver was not the limit. The endurance of the batteries was about 45 minutes, as mentioned above, the replacement battery was then ready for use again. All in all a great device that I can only recommend ...