Panasonic NCR18650 Cell Specifications

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Korishan said:
HBPowerwall was referring to this. Just because they have spots on them doesn't make them fake. Just means they were spot welded.

If you still believe these are fake, please feel free to explain why you think so. Maybe they are, more information is needed.
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Ohhh ok lmao I understand what happened here.

When I said "dots around the positive terminal" I wasn't referring to the spot weld marks. I was referring to the spotted pattern on the shrink wrap grouped closer to the positive terminal on the wrap. The ones that say NCR18650 in giant print in the middle. Those are fake. Panasonic never made those.

They were an attempt to imitate the pattern that Panasonic used in their 2250mah 18650s, in the early early 2010s. That wrap was green and, again, used on a battery that was 2250mah. Not the 2600mah other commenters have found. Panasonic leaped from there to the >3000mah 18650s using the shrink wrap design we all associate them with today soon after. At the same time they started using a grey shrink wrap, like the ones originally shown at the top of this thread, with the same markings the green 3400mahs still use. This was the NCR18650BD. Those are authentic. The spotted grey ones are not.

They are early versions of the generic 2600mah mega mass produced "China brand" 18650 that anybody who's ever bought a $1 18650 off a random AliExpress or eBay seller knows very well.

Look at the insulator rings. There's literally 3-4 of them, because they aren't a hard plastic or barley paper, they're just a thin paper sticker. Does that look like "made in japan" quality to you? Look at the wrap. Have you ever seen a worse shrink wrap job? Does that look like it was done by Panasonic? Look under the wrap, if you can, do you see a QR code? Any markings at all? Look at the reviews from other commenters that are mentioning the issues with these cells.

What other proof do you want? I have a couple of them I pulled out of an unbranded replacement laptop battery manufactured in 2014. They had ~0.8V when I removed them, probably less now, so I can't exactly run a high discharge test for you but I'll see what else I can do. What would you like?
 
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jeffy6, those copies that are presented in my photographs are the original, because they were installed in the original battery supplied from the factory, along with the laptop. The sticker on the positive contact is an additional insulator applied by the manufacturer. If you are careful enough, you will notice that the dots are only on the batteries of laptops pulled out of the batteries, they are not on separately sold batteries. I have charts of recent tests on my batteries. Given that I took it apart about 8 years ago, and the laptop is 15-18 years old - this is a fantastic result:

Refresh mode. Last Stage "Charge"
​
Charging up to: 4.2v
Voltage after rest: 4.155v
Resistance: 0.133Ω

Charge Slot 2 Panasonic NCR18650 (Grey 1) (IR )Finish.png



Refresh mode. Last Stage "DisCharge"​

Discharge up to: 2.5v
Capacity: 2519mAh
Resistance: 0.150Ω

DisCharge Slot 2 Panasonic NCR18650 (Grey 1) (IR )Finish.png




P.s. Please don't write nonsense. As for your batteries, take them to the battery bin :)
 
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the dots are a date range indicator like the stripes in the same place.
the dotted ones are quite old now.
 
I went to look up a batch of new cells I purchased but came up with conflicting information. They are new Panasonic NCR18650GA (see picture below) but the database says NCR18650GA are Sanyo cells. I can't get to the QR code on my cells without stripping the wrap which I prefer not to do on new cells. They test out at 3500-3600 mah with this cell the lowest of all at 3490. Is the database wrong or can someone explain what I am seeing?

@add - Ahhh - I see what's going on. The database seems to have an error. The data sheet referenced in the database specification section for the Sanyo cell actually refers to Panasonic data sheets. Someone may want to check the details on that database entry.
 

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Here's a better picture in case someone wants to update the database.

@add - After going down the rabbit hole on trying to figure out these cells, it appears they are both Sanyo and Panasonic. Sanyo makes theirs in Japan (and are usually button top) and Panasonic makes theirs in China supposedly to the same specs but flat top. :unsure:
 

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kc8adu said:
the dots are a date range indicator like the stripes in the same place.
the dotted ones are quite old now.
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We discuss spots from resistance welding on the positive and negative contacts.
 
Maximus Panin said:
We discuss spots from resistance welding on the positive and negative contacts.
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Was that responding to me? This thread is "Panasonic NCR18650 cell specifications". It's in the section of the forum of the cell database (which seems to be in error) which is why I posted here. I'm not sure what spots from resistance welding have to do with Panasonic 18650 cell specs.
 
DiggsUt said:
Was that responding to me? This thread is "Panasonic NCR18650 cell specifications". It's in the section of the forum of the cell database (which seems to be in error) which is why I posted here. I'm not sure what spots from resistance welding have to do with Panasonic 18650 cell specs.
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Perhaps I didn't understand your English correctly.
 
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