MAKITA Cordless IMPACT driver
9.6v Variable speed (0-2,200 RPM) for controlled driving starts
(Torque 608 in. lbs) Battery Ah 1.3 NiCad
18.0v True variable speed (0 - 2,600 RPM) for controlled fastening
(Torque 1,260 in. lbs.) Battery Ah 2.6 NiMh
From the Makita web site, these are two of their Cordless Impact Drivrs.
The first one uses the older 9.6v 1.3 (1300 mah) Ni-Cads, the second is one of their NEW 18v units. The 18v unit uses 2.6 Ah NiMh batteries. (I have a couple w/ the 3.0 Ah packs)
They DOUBLED the VOLTAGE, DOUBLED the Mah of the Batteries, and DOUBLED the Power. You can bet in order to achieve this they also reduced the internal gear ratio by close to 50% since the rated RPM is almost the same.
A third unit utilizes the NEW Li-On 18v pack, this unit is also rated similar to that of the 18v Nimh powered unit
(Torque in.-lbs. 1,280) Battery Ah 3.0 Li-On , but this unit has way more run time and utilizes a 45 minute FAST Charger, and weighs a lot less.
FUNNY I don't see ANY 3800's or 4200's used in POWER TOOLS, maybe we will in 3 or 4 years.