I haven't seen any issues while slightly undervolting the Dyson V7 animal - I've been using a DeWalt "20v" lithium ion batter (really it's 18v) for a year now with no issues. Technically the Dyson wants 21.6V but like I said - no issues yet. The Dyson V10 upped the voltage so handheld batteries can't be used on that version and you won't find adapters for sale as a result. Have you seen any examples of undervolting at 18v leading to issues? I know Dyson has a low voltage cutoff that I hope protects it. Thanks for your comment!

@@AsaMakes Yes, batteries vary in voltage from completely full, to completely empty. My point was there was no mention in the video of not using a 56V battery on a 21.6V Dyson, or conversely, a 12v battery on a 21.6V Dyson. As an aside, I would be curious where you learnt that Dyson has a low voltage cutoff from, though?

Thanks for the feedback - I'll update the description to make it more clear. The Dyson handhelds must have some type of low voltage cutoff but I haven't been able to find any documentation. Your comment now makes me realize I don't know if it's in the Dyson battery or in the vacuum. When running the default battery the vacuum will stop running abruptly instead of a steady decline as it depletes the battery. The only battery data that would make sense to trigger on is some combination of volts and/or volts and time. I'm willing to bet there's a lower voltage threshold and maybe some filter to ignore big voltage drops when the motor is spooling up. So I assume: when the vacuum (or maybe the Dyson battery pack itself) measures a low voltage it shuts off abruptly. But again - no idea if this is done in the vacuum or the Dyson battery pack. So it's possible that depleting a DeWalt battery starts to do harm without a proper battery management system. I would worry about the battery lifetime more than the vacuum. I'm not an electrical engineer but I wouldn't expect undervolting a DC motor would do any harm to the vacuum. What are your thoughts?

I've just converted my V8 to a 5S Makita battery pack successfully. I did some tests using a bench power supply, turns out that the Dyson has a 15v low voltage cutoff. Which means for a 5s battery, the BMS hasn't even kicked it as 3v per cell is still in a very safe zone. And the motor speed at full voltage and 15v are the same, probably a very efficient brushless motor in the Dyson. Conclusion, it is very safe to use a 5s power tool battery pack for the V7/V8, even though the original battery pack is 6s.

@@AsaMakes What about the AH of the battery--does it need to be something specific? I know you're using 5ah...if I used a 20V battery with 2ah or 3ah, would that work or no? --total newbie to this kind of thing so any input would be greatly appreciated!

Excellent! Glad to hear it I love my 20v DeWalt tools, I only wish they weren't so expensive! Thanks for watching

As long as the Craftsman batteries are 18v and someone makes an adapter it should work! Although I believe your Dyson will have to be a V8 or lower, with the V10s and up they upped the voltage of the Dyson vacuums. I hope you give it a try and it works!

Oh and thanks for watching!

Yes I have one of these (a proper DeWalt brand one) The only issue is I've noticed some kind of parasitic power draw when I use my 20v battery on my 18v DeWalt drill - it will drain the batter if I leave it connected. Not sure if it's an issue with my drill or my adapter. Easy fix - I just don't leave the battery connected. Thanks for watching and for your comment!

Thanks! Like I said I really like the vacuum and I'm glad someone made an adapter so it's actually usable

NO CAN DO TOO MUCH CAFFEINE lol, thanks for watching!

can see it as a trigger for some who have vertigo. on the upside the camera is stationary and not moving. can imagine people with motion sickness getting sick watching when both the person holding the camera moves and the constant hand movement of the person speaking at the same time (definitely seen tons of those on YT)

They make those too. Good luck!

With the 5amp-hour DeWalt battery mine lasts 20 or so minutes, and when it runs out I just swap to my 2nd battery

I've been running my Dyson v7 (also 21.6v) on a DeWalt battery (called 20V Max but really they're also 18v) for more than a year with no issues. Are there any Amazon reviews for a Ryobi adapter?

I had a similar issue when the waste cover - the piece that hinges - wasn't closed completely. And other people have reported a similar issue when the filter is very clogged. Was it doing that before the battery swap?

I've been using the same two 5ah DeWalt batteries since before I made this video, and I really use the heck out of the vacuum cleaner. So for me it has been a great investment. The run time is around 20 minutes

I took a look as well but wasn't able to find any adapters for Benchmark batteries - I don't think Benchmark has enough market share of handheld tools for someone to sell an adapter for Dyson vacuums. Sorry but thanks for watching!

Thanks so much for takin a look. I figured as much. Welp. Ill figure it out

Most likely though all the black and decker battery tools I've owned have had a low battery capacity (like 2 or 3 amp-hours from memory). So if you do get an adapter and use it with low capacity black and decker batteries you might not get a long run-time with the vacuum before needing to recharge. Check the capacity of your batteries so you aren't surprised!

I don't believe so as the V10 and up use a higher 25.2 volt battery

Unfortunately I don't know anything about the DC43H, this works for my "Dyson V7" and should on the V8 but this one I'm not familiar with

@@AsaMakes- well thank you for the quick reply. I looked on Amazon, not a single vendor selling these batteries includes my model for compatibility purposes. I fail to understand why my model is so unique. It looks like any others similar to mine, even the battery appears to be the same. I'm bewildered.

I'd say 15 minutes is about what I'd expect out of a 3AH battery, my recommendation is to buy a 2nd battery to keep charging so you always have a fresh one

thank you. the other Dyson stops and then you have to wait a min or 2 then starts again....then it stops you wait and so on.....would a bigger battery be better? @@AsaMakes

If it's starting and stopping that's probably not the battery, have you checked the filter is clean? Also on mine there was an issue that the waste bucket wasn't closing all the way and would come partially loose causing it to stop

thank you so much for your quick replay. Yes I have cleaned the filters and cleaned both dysons. There is nothing blocking the intake inside the Dyson and it is completely closed. It is so strange. I thought I finally found my perfect solution so I could actually clean the whole house and not have any issues. So so sad!!!! @@AsaMakes

Darn, wish I could be more helpful, at least with the one that runs for 15 minutes a larger capacity battery (6ah, etc) will give a longer time time. I use two 5 amp hour batteries so one is always on charge. After using this for a year I'm starting to notice one of the batteries is getting weaker but that is to be expected - batteries will degrade over time with repeat use

I didn't cover this well in the video! The new Dyson vacuums run at the 25V, the older ones like I have at 20.5 or 21.5 Fortunately there aren't battery adapters for sale for the higher voltage Dyson V10 etc

@@AsaMakes You really do not understand anything about batteries. Better do not play things what is not for you or educate yourself.

What is your technical concern? Undervolting a 21.6V device with a 18V battery is not a fire risk, worst case the device doesn't turn on... this isn't a constant power device that ramps up current if volts are low The higher voltage 25V Dyson vacuums (the V10 and up) don't have adapters for handheld power tools batteries