The v8 uses 20700 cells, not a common size. They are in a case that is thick (for protection). I have opted for a 21700, for lower cost, higher capacity, and greater choice. I'm looking for ways to protect my cells and still fit within the Dyson pack, at least until I can find a way to build my own design in CAD for me to order from a 3D printer. I can do CAD work, but I haven't had time to dig into what software is used for printing.

@ericvincent3219 Since you're not gonna be able to reuse the cell holder with 21700s, just tape the pack together with kapton tape with silicone pads as spacers(nano tape that has lost its tack would be a good choice).

Their products are absolute crap

I'm using a $35 charger/tester and some wires to check capacity on each battery cell while still in the pack (it's jank but safe). They're 3000mAh cells like shown above, and the 3 I've tested so far are 2289 mAh to 2315 mAh on wife's V8 Animal. I got the cells out of the case with some patience, some $7 car trim pry tools that I overpaid for, and there are no scratches on the casing at all. It's mostly patience, but not much past that... I am likely going to replace all the cells, and they're less than $10 each, and I have an $80 cell welder. So I'll have about $175 in one battery, but I also have a battery Dremel, two Ego 2.5 Ah batteries, and I'm sure a few more I can't think of...so really it's not a huge investment in tools. In the end, $6 x 14 (unless I go with LFP and it's 16S and new BMS) for a new 2.5 Ah battery for Ego instead of $150+ per battery.

@@ericvincent3219 can you report back how the cell replacement went? I’d like to do the same. I don’t have a cell welder though. Would it be possible to rebuild without one? Have you found a source for the replacement cells that you could share? Thanks!

@@TuneYourOrgan Henry, I have purchased the cells for retrofit, but I chose to use 21700 Molicel 45a, 4200mAh cells. These take an extra 6mm in stacked width, which will fit within the pack, but I discovered the 21700 spacers make the pack too long. I'll be using kapton tape to make my own pack configuration (I will mimic the OEM 6-in-a-line). I'd love to have snap-in batteries like a toy AA/C/D one, but haven't found any. I ended up buying a cell welder, and can't imagine any way to do it otherwise...but given how much lithium I'm owner of, I can now fix any of them using this. In my mind, that justified the $80 I spent. I also spent $40 on an Xtar VC8 8 battery charger/capacity tester, and then I purchased the cells from 18650batterystore.com for about $6 each, plus spacers, nickel strip, and spacers. I have more in the rebuild than what a single Dyson battery is, but given that I have a cordless Dremel, 2x Ego batteries, 2x Ridgid (granted these have forever warranty), etc. it made sense to put down the money up front and know I'll be better off going forward.

@@ericvincent3219 thank you for the info! I was hoping I’d be able to replace the cells myself maybe having to solder the connection, but sounds like no :/ someday when I have more space I’d like to get the equipment you mention

What is what I want to do. I ordered some Molicel P42A so hope I will no longer have any issues running on max setting. Edit: could you fit the 21700 into the housing?

@@certifiedalchemist It won’t with the shell of the pack. I tossed it and just wrapped some electrical tape around the cells

@@certifiedalchemist did the molicel P42A fit in the housing? I use the wall mount so I’m worried taping up the bottom like OP will prevent it from fitting in there

@@TuneYourOrgan I cut the plastic shell for the cells in half (or actually cut 2/3 away). So the cells still had some grooves to rest in and then just taped it with kapton tape to hold it together. Snug fit, but once it is in there is no problem. It worked out great. Original battery could do 7 mins on max when it was brand new. With the P42A's it goes for 12 min.

@@certifiedalchemist These are the same cells I chose. If I understand what you've written, the "sides"--which would be the top and bottom while sitting flat on the table--would be left, and the batteries would be the meat if it were a sandwich? I was going to wrap as many layers of kapton as I could fit for impact protection, but if you have something that works, I will likely go that direction.

I've since moved away from Dyson and gone to GTech after having loads of problems with these.

I would start looking for a fuse

Unfortunately I'm used to it, especially with these kinds of battery, that metal tape cuts you to ribbons. I might start wearing gloves! 😂 Thank you for noticing though, much appreciated!

As many as you can get, the bigger the number, the longer it will run

Great video mate, could I replace the battery with a 12800mah battery? The volts are the same as old battery it’s just a bigger mah,,current battery is 1300mah 22.2v, replacement I’ve been looking at is 12800mah and 8800mah both 22.2v, Thanks

I don't see any reason why not as long as it's the same chemistry and voltage

@@backofficeshow yes the chemistry is the same just a bigger MAH than oem

Yeah, I agree, totally crap and actually loosens up with use. Probably cost several lifetimes of regular vacuums as well 🤦