"Bosch claim 65% longer run time than their 3ah battery and i can belive it! this battery is putting in the same amout of screws as 3 of my Hitachi 3ah batteries. they charge in 45 mins, the battery life indicator is reaaly handy. Once it goes down to 1 they still just keep going then it will flash one led and still put in quite a few roofing bolts before finally giving up. If the price can be held at what they are they are the cheapest 4ah battery on the market which makes the tools a very attractive buy."
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Review 2 for Bosch 18V 4Ah Li-Ion Coolpack Battery
"These battery's seem to last forever I have one for my drill and one for my impact driver .I've never actually ran completely out of charge . My other drill that this replaced had 2x 1.5 ah battery's and i needed to charge one if not both every day.So all in all I'm very happy with this purchase."