Using 18V XR Batteries with Dewalt 20V Screwdriver Set: Compatibility and User Experiences

Hello, maybe the topic has already been reheated ... if so, I would ask you to be redirected to the appropriate topic for which I would be very grateful :)

Namely, I recently bought a set of dewalt screwdrivers working on 20v batteries, can I easily buy 18v batteries available on our market and work on them without any problems? The trader from whom I bought the set said that they can work on 18v XR batteries without any problems, but it is known that with traders, one will tell the truth, the other will not sell the goods, if anyone has any information on this subject, I would ask you to share them with me .

Regards

You can, the negative effect will be a little less power. I know from practice that the power is more influenced by the quality of the cells (rechargeable batteries), and more precisely by their internal resistance, than by a dozen or so percent difference in the supply voltage.

How the batteries will approach it like this.

The set is Dewalt 20v DCD771 + DCF885, an impact driver and an ordinary two-speed screwdriver, I have a converter for our 220v for the set, I have been working with the equipment for over a month without any problems.

So I can easily buy 18v batteries at the expense of just a slight decrease in power?

What about buying other 18v devices for 20v batteries? will something threaten the devices when they get a little more power?





Regards

kura13 wrote:

These tools have a speed controller. In fact, it is a potentiometer that controls the transistor. The transistor may be partially open, which depends on the voltage on the gate, so lowering the voltage may result in not only power reduction, but also a drop in rotational speed.

I understand, and the difference in power and RPM between 18v and 20v is very noticeable? maybe a stupid question but I have no comparison. The most important thing still not fully explained using 18v batteries on 20v devices will expose the device to failures much faster than on 20v batteries that are included in the set?

I have not yet looked specifically for batteries, as much as I noticed, my batteries are marked with 20v max, they have a capacity of 1.3Ah and do not have current power status LEDs, and the 18v available on our market, I can see that they have.

Hmmm, from what I can see, it is probably not worth testing my devices by trial and error, the more that I do not know about electricity.Any moment in a few days I can get myself batteries or other 20v device from the states for a much smaller helmet, the only downside it is not a guarantee.

In theory, from what I understood, I can run on my 20v 18v batteries but not the other way around.

I started something about curiosity and thank you for your help.

Regards

I have a few makita devices, but on the cable and I'm happy with it, but I wanted to try something from Dewalt now and I bought the set quite cheap and from what I looked at various auctions, whether at our place or abroad, the 20v devices are also relatively cheaper.

In addition, I do not do such heavy work with this set, I am a plumber, so I assemble fittings for pipes or radiators, etc. with a screwdriver, no hard work and with a screwdriver I screw in ordinary black screws from time to time when I have to screw a base for fasteners, etc., after some time when I had the print on the screwdriver print in the middle of my hand, I found it time to stop

I was sincerely looking for makita, but the set I was interested in was quite expensive, so I decided to take a risk with Dewalt, my friend also drives for 3 years on Dewalt 20v devices and he is delighted, but time will tell, he bought 20v batteries from the USA.

I bought the set in question for PLN 950, new with the converter, although I had a discount because of a friend who already took Dewalt devices from a dealer where I also bought the set.

Thanks for the info and best regards

The theoretical power difference between 20v and 18v power supply is about 20%. A much greater difference is in the quality (mainly the internal resistance parameter) of the batteries used. And they will decide what torque (Nm) an example screwdriver will have. Most power tools have regulators and we do not work with continuous power. In my opinion, the difference in this case 2v in the batteries used does not affect the correct operation, and there is no risk of damage.

kura13 wrote:

I just fumbled on the internet for this dcd771 and it turned out that it is attention to voltage 18-20V.
So does that impact wrench.
You can safely buy such batteries if they fit

Hmmm is this information checked? or just someone's guesses?

You can use it both ways. These 20V are a bit cheated.

Thank you once again for all your help and best regards

And I recently saw a video of some tester from the USA regarding the devalt in which he explains that 20V max and 18V XR are the same.
This is explained by the fact that, like the battery in the phone, although it has 3.7V, we charge it to 4.2V (with the li-ion characteristic). Battery voltage drops quickly 4.2V battery in use is only a maximum of 5% because it quickly drops to about 3.7 which is considered nominal. The power, and yes, is current limited because, as you know, Li-ion can do ka-boom and gives a high short-circuit current
It is similar here with devalt and not only devalt. Other American products also followed the marketing slogan of 20V max. The battery consists of a package of multiple 5 cells: 2Ah -5 cells, 4Ah 2x5 cells. Each package of 5 cells is recharged to 20V, but this voltage is maintained at the screwdriver for a very short time and cannot be called the nominal voltage. Therefore, the nominal voltage is 18V. Apparently, the EU has imposed a requirement to declare the nominal voltage at which the device works. And so, products in the EU "10.2 / 14.4 / 18V" = USA "12/16 / 20V MAX" that is, respectively, 3/4/5 cells.
So there are no miracles here apart from the marketing that the European Union has curtailed.

Scorpio_123 wrote:

So there are no miracles here apart from the marketing that the European Union has curtailed.

She didn't cut anything back.
Makita in the 10.8V line also switched to 12V. HITACHI (now HIKOKI) have always given 12V PIK, and only 10.8V with tiny letters. And they are normally available with us. This is because people get 12 better than 10.8, no matter that the same power comes from the text itself.
Market inventions have always used this trick and nobody forbids them to do so.

Anonymous wrote:

I can safely recommend makita screwdrivers.

MAKITA has the worst battery warranty, only 6 months, 2 years after registration. DEWALT, HIKOKI (HITACHI) 3 years. METABO 3 years without a relative warranty.