I've been using Panasonic brand for quite a long time now. I've had a 15.6 volt lithium ion with two 3.5 amp hour batterys for at least the last 4 years and it is still going strong with the same two battery's that came with the set. But I did burn up two previous Panasonic drills by putting ship's auger bits into the 1/2" chucks. I have heard elsewhere that it is no problem doing that with a Dewalt 18 volt cordless, so the Dewalt motor itself must be a more powerful motor.
