I have a set of 18-volt cordless DeWalt power tools that I got about 3
years ago. Since I use them rather infrequently, I'm not getting the
lifetime out of the very expensive batteries that I would like. The
set originally had two batteries, but both have since quit working.
I have one replacement battery now, and it seems to be less able to
hold a charge as time goes on.
DeWalt apparently does not make an AC to DC converter that would be
able to power these tools with a cord. This is unfortunate because
it's a pain to have to stop work while the battery recharges. I
presume they don't offer this product because it would eat into their
very lucrative battery business... understandable.
Does anyone know if there is a third-party that makes a corded power
attachment for cordless tools?
I don't know about a third party, but Dewalt makes a product that
would suit you very well. It's about $45, which would be less than
the price of a new battery, and it will actually give you much better
performance than your current setup. See:
(If the link doesn't work, search for Dewalt item # D21008K)
I actually own one of these products (got mine for maybe $35 on eBay),
and I've been very happy with it - highly recommended.
The battery business *is* very profitable and the manufacturers have locked
out 3rd parties by patenting the battery - drill interface/connection. This is
why you don't find 3rd party batteries either. They can't stop you from
getting your battery packs rebuilt, but by welding the cases together some
manufacturers make it more difficult.
I know it ain't a Dewalt but Ryobi is the only one who I'm aware of who
makes a corded 3/8" drill with a clutch. For infrequent use it may do ok.
(Amazon.com product link shortened)
I also needed a new Dewalt battery, tho mine was a 14.4V. 89 bucks was
the best i could find, or 50 for a used one on Ebay. Then I found a
rebuilded. I got a new 2100Mh 14.4v battery core shipped to me for 39
bucks. I just have to put it in the old case and make 2 solder
connections. If you can afford the time to ship him your old battery,
he will do it for the same cost.
they are is California.
The problem that I have is that I have a set of DeWalt tools: Hammer
Drill, Jig Saw, Circular Saw, Reciprocating Saw, and Worklight.
It sounds like I am going to have to design my own converter. I can
take a dead battery, remove the cells, and connect it to an 18 volt
power supply. I was hoping someone had already done this, so I
wouldn't have to think about it.
Oh well, this is a hobby for me so I might as well take the time...
Thanks for your responses. At least now I know what direction to go.
Think about this before you spend time and $$ on this project.
If a 115V drill pulls 6A, then your 18V drill will pull about 38A
for the same power levels. This will take at least 6ga wire to connect
your power supply to the drill. Do you want to deal with the weight
and inflexibility of this cable?
An alternative would be to design the converter/power supply to fit
into the battery case and run a regular power cord to the wall.
The problem in both cases is going to be the transformer. To handle amps
like that, it is going to be WAY to big to fit in the tool and way to
expensive to be practicle. With a transformer that big and the regulator to
handle that power, I would be surprised if you could do it for less than
$400.00 to $500.00.
For this sort of application you don't need a big linear-type supply.
The motor doesn't really care about noisy power, so it would probably be
possible to fit a switching supply into there.
However, one that can provide almost 40A at 18V isn't going to be common
The 38 amps came from assuming the motor was drawing equivalent to a 6
amp corded drill. A 6 amp is toward the beefy end of the corded
spectrum. My milwaukee 1/2" is 5.5 and my ryobi 3/8" is 4.5 amps. So
I think you're looking at less than 30 amps at 18V. I should think
you'd want to know what the actual draw is for all of the tools you
plan on using it with, and hopefully the supply has an overload
protection so you don't blow it out.
If yer close to a home depot, you can buy the ryobi packs, gut the cells
from it (they are the same size) and build yer own packs. I've even seen
replacement packs for no name drills at big lots (a US closeout retailer)
that use the same size cells. Though they are of lesser capacity and quality
than the brand named packs....