Got some 20700A from the Dyson pack :D

Good afternoon everybody. A while back, I tried to open a Dyson battery pack, but it was to no avail.
Today, I threw the battery pack in rage on the ground, and it actually broke one the snaps, and it was quite easy.

And to my surprise, I didn't get high drain 18650s, but I actually GOT 6x20700s high drain 30A cells. I was so happy when seeing them, after I went through all the trouble. Although I damaged one of them, but 5/6 is still a good ratio. They're all 3050mAh on average(2950-3098mAh), so almost new.

I plan on keeping them for novelty until I see a use for them. Otherwise, I'll just sell them for quite a bit of money. I know these aren't 18650s, but they're still applicable. Also, ask any questions you want.
Here's some info on them: https://www.imrbatteries.com/sanyo-ncr20700a-3100mah-30a-flat-top-battery/

Sweet!!!

Soooo, what you're saying is, if we want high capacity large cells we should throw our battery packs in a fit of rage. Got it!!!

No, of course not haha. The welds were so strong, I needed some big pliers to crack open the rest of the pack.

Good find!

Just yesterday I received my parcel with NCR20700B which I will use to rebuild a battery for my vacuum cleaner amongst other things.
It's a relatively recent model made by swedish company Electrolux and marketed under the old german brand name AEG, but uses almost prehistorical INR18650-15L by Samsung. 18650s with 1500mAh and 15A continuous discharge. They sell these batteries as spares for almost 70 EUR which is just insane for a badly made 6S battery. And they are failing all the time, partly because of what I suspect to be old stock of cells, partly because of their crappy BMS.
I knew this prior to buying the vacuum cleaner and the battery that came with my one luckily still works, but I was able to buy another one with a failed battery really cheap. Now I have spare parts for the machine itself, although these might not be needed as it is properly made, unlike its battery, and an empty battery case which I will fill up with six of the NCR20700B. There is easily enough space, the 18650s never filled all the space in the case. The NCR20700B are rated for 15A continuous just like the original Samsung cells but have 4250mAh instead of 1500mAh. I will also throw away the BMS, charge the battery with a balance charger instead and do low voltage cutoff manually with a beeper

I tend to get in touch with my inner cave man if a battery won't open. I usually bash them on a pole, or hit them with a hammer. Works well, of the 30 packs I have opened, I have only dented 4 cells.

How did the cells react? With the bumped cell, I got some muffin odor, a very sugary odor out of it, charged fine, and discharged fine, handled 10 amps without any problems, but I don't have confidence in it.

It was vastly different from the solvent odor from last time I damaged a cell.

Hmm, odd. The few I busted open had that specific odor. Haven't had anything "sugary" smell. Hrmmm

BlueSwordM said:

How did the cells react? With the bumped cell, I got some muffin odor, a very sugary odor out of it, charged fine, and discharged fine, handled 10 amps without any problems, but I don't have confidence in it.

It was vastly different from the solvent odor from last time I damaged a cell.

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I never broke one. The ones I dented still charge and work. I did test this outside! Still sitting in a coffee cup on a brick away from anything flammable. Happily sitting for weeks. I don't want to put them in the car to take them for recycling. I will eventually discharge them, leave them sit in a bucket of water, and dispose of them properly.

Well, the cell I damaged is higher than room temperature now and it's voltage is dropping slowly but steadily. Probably created a very small short circuit inside of the cell.