Test/review of Sanyo NCR20650A 3100mAh (Red)

6 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 05/24/2011 - 12:23
Posts: 7447
Location: Copenhagen, Denmark
Test/review of Sanyo NCR20650A 3100mAh (Red)

Sanyo NCR20650A 3100mAh (Red)
DSC_7760
Official specifications:


  • Rated capacity: 2900mAh at 20°C
  • Minimum capacity: 2950mAh at 25°C
  • Typical capacity: 3100mAh at 25°C
  • Nominal voltage: 3.6V
  • Standard charge current: 2065mA
  • Charge voltage: 4.20V
  • Weight (max.): 55.4g
  • Temperature: Charge: 10°C ~ 45°C, Discharge: -20°C ~ 60°C, Storage: -20°C ~ 50°C

Sanyo%20NCR20650A%203100mAh%20(Red)-info
This is one of the new formats for LiIon, this cell do not gain any extra capacity but can deliver a lot of current.
DSC_7759
DSC_7761 DSC_7762
DSC_7763
DSC_7764
Sanyo%20NCR20650A%203100mAh%20(Red)-Capacity
The discharge curves match perfectly and the capacity do not drop much at higher currents.
Sanyo%20NCR20650A%203100mAh%20(Red)-Temp-15.0
Sanyo%20NCR20650A%203100mAh%20(Red)-Temp-20.0
Sanyo%20NCR20650A%203100mAh%20(Red)-Temp-30.0
The cell gets hot at 30A, my log says 79°C
Sanyo%20NCR20650A%203100mAh%20(Red)-CapacityTimeHours
Sanyo%20NCR20650A%203100mAh%20(Red)-CapacityTime
Sanyo%20NCR20650A%203100mAh%20(Red)-Energy
Sanyo%20NCR20650A%203100mAh%20(Red)-PowerLoadTime
Sanyo%20NCR20650A%203100mAh%20(Red)-TripCurrent
Sanyo%20NCR20650A%203100mAh%20(Red)-Charge
Conclusion
The cell is not a super cell, there ware limits to how much extra performance 2mm extra in diameter gets, but it is a very good high current cell (The next size up is 5mm longer and is better).
It is a very good cell, but do we really need this size (Check 21700)?
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/

stephenk
stephenk's picture
Offline
Last seen: 16 hours 51 min ago
Joined: 01/30/2016 - 05:09
Posts: 1856
Location: Australia

I can see a lot of incompatibility issues if we end up with 21700, 20700, and 20650s. Will one be the VHS and another the Betamax?

Jensen567
Offline
Last seen: 2 years 5 months ago
Joined: 04/10/2017 - 16:59
Posts: 491
Location: MD/DC Area USA

I’m rooting for 21700 for extra capacity, and I just think that form factor will make lights that are well sized.

Texas_Ace
Texas_Ace's picture
Offline
Last seen: 1 day 10 hours ago
Joined: 03/24/2016 - 07:44
Posts: 9402
Location: Everything is brighter in Texas

Luckily they all work the same and should be interchangeable in most things due to the springs if the bore is setup for 21mm cells from the start.

HKJ
HKJ's picture
Offline
Last seen: 2 weeks 2 days ago
Joined: 05/24/2011 - 12:23
Posts: 7447
Location: Copenhagen, Denmark
Texas_Ace wrote:
Luckily they all work the same and should be interchangeable in most things due to the springs if the bore is setup for 21mm cells from the start.

Yes, as long as designed for it, it should be possible to make a 18650/18650 protected/20650/20700/21700 light (Maybe with a plastic sleeve included for the 18650 cell).

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

Splott-Light
Splott-Light's picture
Offline
Last seen: 2 weeks 5 days ago
Joined: 08/20/2015 - 20:15
Posts: 254
Location: Just Outside of England

HKJ,
Many Thanks for the Tests.
Interesting.
Cheers,
S-L Smile

Ouchyfoot to a New Member: Welcome CJ. Now you have to learn about buying an inexpensive flashlight and modifying it until it either blows up, or starts small fires on the moon…………

Hugh Johnson:
I, too, once lived a tragic and empty life. Then I found [portable] light.
You forgot to mention clothes. I sold most of my clothes to fund my light collection. This is actually fine, since I only go out after dark, and most people can’t see me.
Finally, I got my priorities straight.