[Shop-talk] homeowner/ shop guy cordless drill

[John Innis]

The Dewalt 20v 6ah pack uses 21700 cells as well.  Expensive, but there is
a noticeable improvement for SOME tools.  The DCF-900 storm-bringer 1/2
impact driver benefits from the extra current.  The 1/2" hammer drill I
have does not seem to care about it.

On Thu, Aug 3, 2023 at 8:32 PM David Scheidt <dmscheidt at gmail.com> wrote:

> On Thu, Aug 3, 2023 at 5:17 PM <eric at megageek.com> wrote:
> >
> > OK, this has generated a ton of traffic, so I'll weigh in.
> >
> > I'm a yellow and black guy.  Dewalt is my go to for cordless.  They are
> solid and have tools you've never even heard of before.
> >
> > They have adaptors so you can use the old 18v NiCd with the new 20 Li
> batteries. So you can get the NOS tools for pennies on the dollar and they
> will work with the new batteries.
> >
>
> One of the reasons the old nicad tools are cheap is because they suck,
> compared to modern tools of any brand, even cheap ones.  They're
> designed around the power output of the battery pack, and the nicad or
> NiMH batteries didn't provide much power.  This is perfectly fine for
> things that don't draw much power, but it's pretty limiting for
> anything that drills, saws, or grinds.   it's also why cordless saws
> used to be so incredibly gutless, but there are now cordless table
> saws that work as well as most jobsite corded table saws.
>
> Discharge current of a sub-c nicad (the cell in most nicad tool
> battery packs)  is somewhere around 2 to 4 A; the lithium cells used
> in modern tools can produce 10 to 30A depending on the particular
> cells in the pack; milwaukee high output packs[1] (which use
> physically larger 21700 cells, instead of 18650 in their other packs,
> and commonly used by everyone else) can go even higher.  That means
> 18V lithium packs with three sets of cells in parallel have more
> potential power output than a 15A 120V receptacle, and tools with a
> pair of batteries (common for miter and table saws) are quite capable
> of taking advantage of that.
>
> [1] pretty sure other brands have 21700 packs, too.
>
> --
> David Scheidt
> dmscheidt at gmail.com
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