Awhile back I broke down and replaced my old 9 volt makita with a twelve volt. I dont see that the 12 volt battery lasts much longer or is more powerful. My new makita has a keyless chuck. That has its atvantages but too often I need to really crank down on the bit and you just cant do that without a keyed chuck. I wonder if there is a company that a combo keyed/keyless chuck. All in all I preferred my old 9 volt keyed cordless.