Test/review of Sanyo NCR20700B 4000mAh (Red)

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HKJ
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Test/review of Sanyo NCR20700B 4000mAh (Red)

Sanyo NCR20700B 4000mAh (Red)
DSC_7594
Official specifications:


  • Rated capacity: 4000mAH
  • Minimum capacity: 4050mAh
  • Typical capacity: 4250mAh
  • Nominal voltage: 3.6V
  • Discharge current: 15A
  • Charging voltage: 4.20V
  • Standard charging current: 2000mA
  • Temperature: Charge: 10°C ~ 45°C, discharge: -20°C ~ 60°C, storage -20°C ~ 50°C

Sanyo%20NCR20700B%204000mAh%20(Red)-info
This is a new battery size that is slightly larger than the common 18650 cell.
DSC_7593
DSC_7595 DSC_7596
DSC_7597
DSC_7598
DSC_7599
Sanyo%20NCR20700B%204000mAh%20(Red)-Capacity
The discharge curves for the two cells track nicely.
Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-10.0
Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-15.0
Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-20.0
One of the cells got really hot during the 20A discharge. With the other I probably forgot to place the thermo sensor on the battery.
Sanyo%20NCR20700B%204000mAh%20(Red)-CapacityTimeHours
Sanyo%20NCR20700B%204000mAh%20(Red)-CapacityTime
Sanyo%20NCR20700B%204000mAh%20(Red)-Energy
Sanyo%20NCR20700B%204000mAh%20(Red)-PowerLoadTime
Sanyo%20NCR20700B%204000mAh%20(Red)-TripCurrent
Sanyo%20NCR20700B%204000mAh%20(Red)-Charge
Conclusion
This size has more capacity and slightly higher voltage than 18650, without being much larger.
Being from Sanyo/Panasonic it is a ver good cell.
Notes and links
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries
Compare to 26650 and other batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Edited by: HKJ on 01/03/2017 - 09:04
stephenk
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That review was pretty quick after availability! Thanks for your efforts.

lagman
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That’s VERY interesting. Any idea since when Panasonic is producing these cells?
What are the current applications? Only Tesla?

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

HKJ
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lagman wrote:
Only Tesla?

Tesla has decided on another size.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:
lagman wrote:
Only Tesla?

Tesla has decided on another size.


Are you referring to 21700?

The Journal of Alternative Facts TM

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HKJ
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Bort wrote:
HKJ wrote:
lagman wrote:
Only Tesla?

Tesla has decided on another size.


Are you referring to 21700?

Yes, that extra mm gives space for a bit more capacity.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

lagman
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Wondering who is using this size of cells then…

My English isn’t perfect but I’m trying to improve it. If you see something that doesn’t sound right or is just plain wrong, please feel free to point it out! Smile

leaftye
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lagman wrote:
Wondering who is using this size of cells then…

http://www.coptool.com/cordless-power-tool-lihd-battery-cells-18650-vs-2...

The low mode should be lower.

Reviews: Efan IMR18350 700mAh 10.5A, <a href="http://

Henk4U2
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lagman wrote:
Wondering who is using this size of cells then…

huge leaps in e bike battery capacity coming to e-bikes soon

Edit: HKJ, excuse my bad manners. Thank you for reviewing a battery of the latest model and size.

You are a flashaholic if you are forced to come out of the closet, to make room for more flashlights.

will34
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Thanks for the review! Very interesting cell.

nofearek9
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thanks for the review,interesting that it can run so much current .

Hikelite
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Thanks for the review HKJ

We are to expect 21700 on the market too? It’s not clear to me from the articles on the internet.

HKJ
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Hikelite wrote:
We are to expect 21700 on the market too? It’s not clear to me from the articles on the internet.

According to Henk4u2’s link Samsung has a 21700 cell

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Speed4goal
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Well with a piece of PVC pipe or a cardboard or some homemade thing we could use these cells in current 26650 lights that accept 26700 cells.will fit in 26650 charging slots as well.

Would be nice is a major manufacturer would develop the 26650 and we probably could have 7000mah 20+amp cells
Thanks for the review again HKJ your reviews are priceless and help save from purchasing some lemons for sure. Much appreciated the time out of your life you take for all the reviews

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thanks for the review, I enjoyed reading it.

leaftye
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Thanks for the test. It’s not bad, but I can’t get excited until the price comes down substantially. At $10 each, it’d make big battery packs more expensive. Iirc, Tesla claimed 30% lower cost with their 21-70, which I’m hoping is per cell and that’d it’d be possible to buy them for less than $4 each in bulk. Even though this doesn’t put out a huge amount of current, it’d be good enough in a big battery pack, at least for electric bicycles.

The low mode should be lower.

Reviews: Efan IMR18350 700mAh 10.5A, <a href="http://

Bort
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leaftye wrote:
Thanks for the test. It’s not bad, but I can’t get excited until the price comes down substantially. At $10 each, it’d make big battery packs more expensive. Iirc, Tesla claimed 30% lower cost with their 21-70, which I’m hoping is per cell and that’d it’d be possible to buy them for less than $4 each in bulk. Even though this doesn’t put out a huge amount of current, it’d be good enough in a big battery pack, at least for electric bicycles.

If they can provide ludicrous speed in a Tesla then they can power an ebike.

The Journal of Alternative Facts TM

"It is critical that there is a credible academic source for the growing and important discipline of alternative facts. This field of study will just keep winning, and we knew that all the best people would want to be on board. There is a real risk in the world today that people might be getting their information about science from actual scientists"

 

leaftye
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Bort wrote:
leaftye wrote:
Thanks for the test. It’s not bad, but I can’t get excited until the price comes down substantially. At $10 each, it’d make big battery packs more expensive. Iirc, Tesla claimed 30% lower cost with their 21-70, which I’m hoping is per cell and that’d it’d be possible to buy them for less than $4 each in bulk. Even though this doesn’t put out a huge amount of current, it’d be good enough in a big battery pack, at least for electric bicycles.
If they can provide ludicrous speed in a Tesla then they can power an ebike.

Of course they can. 18650’s have been doing it for years. Anyone can build a fast bike. Affording it is a different matter. Building my own packs should save me about a thousand dollars…if I don’t burn my home down.

The low mode should be lower.

Reviews: Efan IMR18350 700mAh 10.5A, <a href="http://

StandardBattery
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Great!! This is an interesting direction for industrial cylindrical Li-Ion cells.

The ready access to these cells outside of industry buyers make me think, it’s possible this 20700 cell will be short lived as they standardize on 21700 going forward, although they can be considered roughly equivalent. It could also be though that since they are new there is not yet the industry demand to take up all production.

My cells are similarly wrapped and coded with a couple differences. The 4 digit code following the cell part number on mine is 6612; likely the date code. The code laser etched on the negative terminal is similar except the first digit preceding the U is separated from the group by the width of a couple of digits on a couple of them. This code is slightly different on each of my cells except 2 have the same code on the bottom. This leads me to believe this may code the specific factory, lot, and manufacturing machine specifics.

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It could go either way, or neither way. It largely depends on Tesla’s ability to meet their expectations. Several Gigafactories around the globe, and Tesla cars and Powerwalls in most new middle class houses would sway things heavily towards the 21-70. Occasionally sales will slow, and I have to think that they’ll open up sales of their batteries to secondary customers.

I thought they already started producing the 21-70, but that was just for testing, and even that only started last month. Today they started producing 21-70’s that’ll end up with customers.

https://www.tesla.com/blog/battery-cell-production-begins-gigafactory

The low mode should be lower.

Reviews: Efan IMR18350 700mAh 10.5A, <a href="http://

shadockan
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As shown changed the ‘’ game ‘’ …..

There is also the LG INR20650HG6 3000mAh 30A

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Not sure if this is posted already, but NKON is selling this battery as of today: https://www.nkon.nl/rechargeable/18650-size/sanyo-ncr20700b-lithium-batt...

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Do you know what temperature battery A reached at 20A?
HKJ
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torchythebatteryboy wrote:
Do you know what temperature battery A reached at 20A?

It is in my logfile, but you have to add somewhere between 25 and 30 to the relative temperature.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

torchythebatteryboy
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HKJ wrote:
torchythebatteryboy wrote:
Do you know what temperature battery A reached at 20A?

It is in my logfile, but you have to add somewhere between 25 and 30 to the relative temperature.

It appears these bartteries have a temperature coefficient device. I have had three of them die when testing. I got full discharge at 20A continuous current from 2 batteries. One died during 30A continuous current discharge, 119.3° C temperature, and two died during 40A continuous discharge, one at 105.8 and one at 97.8. But another gave a full discharge at 30A continuous current reaching 120.2°. The cut off temperature seems to vary from battery to battery.