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A standard cordless compact DeWalt 18V drill with a high performance motor that delivers 380 watts. Equipped with easy to hold design that allows you to work in difficult spaces.

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What's the biggest 20V pack that can be SAFELY run?

I have a DeWalt DC970 from years ago and no batteries as they are dead. That said, I have primarily moved to 20V tools but this drill still works just fine; I just cannot buy the original batteries as they were discontinued being NiCd 18V. The batteries have long since been scrapped and were discontinued in 2021. I have XR and Atomic 20V tools as well as one standard non XR saw I keep as a backup to the XR saw. I once had two packs and the drill was shipped with 1.2Ah batteries but I know DEWALT sold 4Ah NiCds at one point too.

Despite having the higher end tools, I still want to keep this one around for jobs I do not want to run my good XR drill on. I have the DCA1820 and 4x 5Ah packs (18650-based) and 2 PowerStacks (5Ah/1.7Ah), so I am wondering what the sweet spot for the older 18V tools is. I did look into a brushless 20V entry level drill on sale for the batteries, but I looked into that years ago before I got 6 20V batteries. I don't think that plan makes as much sense now unless I get some insane deal on a 20V Brushless with 2 2Ah batteries.

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Just checking my math against the reality of the situation since the war over cheap TVs is coming up, and I can probably score a drill+impact+2Ah set on sale, or at least a brushless drill and 2x 2Ah packs for the $100 sweet spot should I need it:

On the original NiCds, you had 3 capacities if my research is correct:

  • 1.2Ah (base packs)/21.6Wh
  • 3Ah (Upgrade)/54Wh
  • 4Ah ("XR" range, but worked with the entire NiCd tool range without fuss)/72Wh

Now compare this to the 20V packs (which Dewalt confirmed is within the probable safe range):

  • 1.5Ah (Previous base pack, no longer sold best I can tell)/30W
  • 2AH (Current base pack/40Wh
  • 3AH/60Wh
  • 4AH/80Wh -- this is probably the "safe point" I should stick to if I don't want to tempt fate since it's MARGINALLY over the highest packs ever sold under the 18V system. 8Ah over is probably a rounding error.
  • 5AH (what I mostly own)/100Wh -- I can use these on my native 20V tools if 4Ah is the safe point and grab some 3/4Ah packs, while getting my initial replacements in a black Friday drill discount as "safe packs" I can interchange.

Beyond 5Ah is NR if I have the right information from DeWalt, but that's all I got from them. I don't think they have much information on the adapter with the NiCd tools because they assume people will upgrade to new tools as I did, but I also like the drill as a knockaround and always have; I can have my favorite 20V tools, and keep my workhorse 18V going this way.

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I don't think you can use an Li-ion battery in this drill. It needs Ni-Cads. If you do an internet search for "dewalt dc970 replacement battery" you will find aftermarket replacement batteries for your drill for $20-$30. I had the same issue with an older Makita drill (which has more guts than the newer Dewalt drill) and the aftermarket batteries work fine.

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No. It’s known to take them with the DC970 paired with the DCA1820.

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