Tested 18650 cells - 30Q, 25R, VTC5 | from €100/kWh | [EU]

ladapavlas

ladapavlas

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Jun 24, 2021
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Used 18650 battery cells. Clean, rewrapped, tested and ready to be spotwelded into a battery pack.

You can place your order on our website: www.revivalbattery.com
Direct product links:
Note: Minimum order quantity is 100pcs
FREE Shipping on orders over 1000 cells.

Description:
  • Tested for self-discharge
  • Capacity tested at 1C current
  • DC internal resistance measured according IEC 61960-3:2017, paragraph 7.7.3 (Note that DC IR is very different from the more commonly used AC IR)
  • All measurements were carried out using calibrated custom-designed equipment
  • Most cells are fitted with new shrink wrap and insulator, others have their original one undamaged
  • Residuals from spotwelds were carefully removed leaving a smooth surface for spot-welding (see attached photos)
  • We provide a spreadsheet with parameters of each cell in your order. The parameters include cell ID, capacity [mAh], energy [Wh], DC iR [mΩ]
  • All cells are shipped at 3.5V (+-0.03V)

Atm, our website has shipping options only for countries in the EU. However, we can send packages mostly anywhere in the world. If you live outside the EU, you can PM me or send an email to info@pavlasbattery.com, and we will arrange the order and shipping for you.

We are Pavlas Battery s.r.o. company, based in Czech Republic (in center of Europe)

If you have any questions, feedback, or anything to say, you can reply here, PM me, or send us an email at info@pavlasbattery.com



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How are these prepared? Are they just close snipped, or using some kind of abrasive?
 
Not just close snipped. Any residuals from spotwelds were carefully removed with a specific dremel tool. The photos are accurate. It shouldn't have any adverse effects on further spotwelding, as it doesn't leave a crater or anything and has no effect on functionality, obviously. It's more of a cosmetic detail and shouldn't be of a concern. Attached a couple more detailed photos of Samsung INR-25R.


IMG_1718.JPG IMG_1720.JPG
 
ladapavlas said:
were carefully removed with a specific dremel tool.
Click to expand...
I'm not worried about cosmetic, I'm more worried about the nickel coating of the shell being removed and exposing the steel casing to the atmosphere. These cells are only nickel coated, not an alloy. So by removing the outer layer of nickel, O2 in the air could start to cause oxidation, aka rusting.
Since you are selling these, I would recommend not using an abrasive to remove the excess bits left from the side snips for liability reasons.

It's possible it will never happen. But it's also equally possible it would.
 
That is a valid concern. We have lots of these cells that have been processed more than a year ago and haven't rusted at all. However, they are likely to rust whenever water gets on the bare steel, either due to condensation or something else. We've had that happen. And although it is barely noticeable, over a couple of years, it could be a problem. All cells are inspected before shipping.

We are working on implementing a process of coating the affected areas with an aluminum-zinc coating, that prevents oxidation, is conductive, and can be spot-welded on without any issues.

But this might change as we're going to introduce a different, more sophisticated, and mainly automated method of removing the spotwelds.
 
Korishan said:
I'm not worried about cosmetic, I'm more worried about the nickel coating of the shell being removed and exposing the steel casing to the atmosphere.
Click to expand...
I am sorry, i agree with Korishan.
I used a angle grinder on a lot of cells that where spot welded....all started to rust at those spots.
Yes i can handle a angle grinder like you can handle your dremel.
It is better to snip them off and leave the dremel alone.
Those cells are better off for soldering (to cover the damaged aria) to prevent rust, instead of spot welding, sorry to say, no hard feeling are involved.

With best regards igor
 
While a little ugly cosmetically leave the tags on the end. Cut tags off leaving an area to solder to. I see manufactures specify no warranty if cell directly soldered. On another matter I want to share this.. https://batterybro.com/pages/18650-date-code-lookup-tool but feel if could be posted in a better part of the forum but as a newbie the stupid forum wont let me make a post. I recently purchased new NCR18650b from an importer with the date code 2028 which the batterybro link above dismissed as possibly fake/counterfeit.
This online tool is great as it shows the day and date of manufacture which takes all the guess work from working out cell age.
The importer told me the 2028 is the expiry date.. go figure. Cheers from a locked down New Zealand. Mark
 
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