Yes, all of the 14.4 Volt batteries will work with the 14.4 Volt tools. If you are upgrading to a different battery, such as the Lithium Ion batteries, you may need to replace your charger as well. The charger for your NiCD batteries wouldn't charge the lithium batteries, you would need to purchase a new charger. The new charger for the lithium battery would also be able to charge all of your nickel based batteries.
I hope this helps!
-Mark
Review by k_leenig@hotmail.com 01/23/2009
When this tool works, it's fine. God forbid that the chuck should fail as it did on mine. I've removed chucks on drills for thirty years and never encountered one I couldn't replace before this one. The chuck that came with the drill literally fell apart in my hands when I went to change a bit. This should never happen. Even after investigating how to replace it on the internet, it seems impossible to do. Further, about twelve years ago, I bought two 14.4 dewalt drills and they still work fine--slightly different model. The batteries lasted a long long time while being used commercialy. I don't know what happened, but I've had bad luck with the new batteries that came with this drill. In one case, one battery wouldn't hold a charge at all, and the other doesn't last very long. I have four dewalt battery drills along with a number of other dewalt tool, and I'm thinking about completely switching over to another brand.
