I just purchased the above kit using the 10% rebate coupon Cellardoor posted (thanks), along with a 10% Customer Appreciation coupon I picked up at my local HD. The 9212 appears to be the 921 combo with a 12 volt right angle driver and 18 volt Max HC batteries. Anyone have any experience with these 18volt Ridgid tools? Are they NiCad batteries and are they in any way different from Ridgid's regular 18 volt bateries? And, assuming they are NiCad, anyone have any thoughts on the best way to maximize the useful life of the batteries on an ongoing basis?