Test/review of Samsung INR21700-48G 4800mAh (Gray)

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Thu, 01/04/2018 - 12:58
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HKJ
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Test/review of Samsung INR21700-48G 4800mAh (Gray)

Samsung INR21700-48G 4800mAh (Gray)

DSC_2593

Official specifications:


  • Typical standard discharge capacity: 4800mAh
  • Minimum standard discharge capacity: 4700mAh
  • Typical standard discharge energy: 17.4Wh
  • Minimum standard discharge energy: 17.04Wh
  • Charging voltage: 4.20V
  • Nominal voltage: 3.6V
  • Standard charging current: 1440mA
  • Rapid charging current: 4800mA (Not recommended for long life cycle)
  • Max. discharge current: 9600mA (Not for cycle life)
  • Max. pulse discharge current: 30A for 10sec, 25A for 30sec, 18A for 60sec
  • Discharge cut-off voltage: 2.50V
  • Operating temperature: Charge: 0° ~50°C, discharge -20° ~ 60°
  • Storage temperature: 1 year: -20°C ~ 25°C, 3 months: -20°C ~ 45°C, 1 month: -20°C ~ 55°C
  • Internal impedance:
  • Internal resistance:
  • Cycle life: 500 cycles to 75% at 23°C or 70% at 45°C (Charge=0.3C, Discharge=1C)

Samsung%20INR21700-48G%204800mAh%20(Gray)-info

This is a high capacity cell in the new 21700 format.

DSC_2592

DSC_2594DSC_2595

DSC_2596
DSC_2597

Samsung%20INR21700-48G%204800mAh%20(Gray)-Capacity

Nice tracking discharge curves with fairly constant capacity, but the cell cannot handle above 10A without heat problems, this is acceptable with a maximum rating of 9.6A
I only discharge the cell to 2.8V, not the rated 2.5V and get a bit less than full capacity.

Samsung%20INR21700-48G%204800mAh%20(Gray)-Temp-7.0

Samsung%20INR21700-48G%204800mAh%20(Gray)-Temp-10.0

Samsung%20INR21700-48G%204800mAh%20(Gray)-Temp-15.0

Battery gets to hot and i stop the discharge.

Samsung%20INR21700-48G%204800mAh%20(Gray)-CapacityTimeHours

Samsung%20INR21700-48G%204800mAh%20(Gray)-CapacityTime

Samsung%20INR21700-48G%204800mAh%20(Gray)-Energy

Samsung%20INR21700-48G%204800mAh%20(Gray)-PowerLoadTime

Samsung%20INR21700-48G%204800mAh%20(Gray)-TripCurrent

Samsung%20INR21700-48G%204800mAh%20(Gray)-Charge



Conclusion

This is highest capacity 21700 cell at the current time (Jan 2018) and it looks very good, but it is not designed for high current discharges or fast charging.



Notes and links

The cell was supplied by a reader for review.

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

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Thu, 01/04/2018 - 13:55
ECHO
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Excellent work as always HKJ, thanks!

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Thu, 01/04/2018 - 14:10
ChibiM
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4800 is pretty impressive! 

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Thu, 01/04/2018 - 15:05
FPV
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very nice cell, thank you for the detailed review.
I think I will try to bore out a light to try a 21700.

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Thu, 01/04/2018 - 15:50
MRsDNF
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Thanks HKJ. Thumbs Up

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Thu, 01/04/2018 - 16:09
Agro
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That was a long wait….but thanks for the test, great as always.

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Thu, 01/04/2018 - 16:18
HKJ
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Agro wrote:
That was a long wait….

Yes and my queue is still very long.

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Thu, 01/04/2018 - 16:37
will34
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Thanks for the review! I’m hoping to see multi 21700 lights soon.

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Thu, 01/04/2018 - 18:36
Henk4U2
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HKJ wrote:
This is highest capacity 21700 cell at the current time (Jan 2018) and it looks very good, but it is not designed for high current discharges or fast charging.

Always charge my batteries at 0.5Amp (when not in a hurry Wink ).

Thanks for the review!

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Thu, 01/04/2018 - 20:09
DENGOH
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Thanks for the review.

May I know what is the advantage of 21700? It seems to perform not as good as a good Liitokala 26650.

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Thu, 01/04/2018 - 23:36
HKJ
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DENGOH wrote:
May I know what is the advantage of 21700? It seems to perform not as good as a good Liitokala 26650.

Size

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Thu, 01/18/2018 - 12:19
ZoomieFan
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Capacity is a little less than I hoped for.
Any idea what’s the difference with this version?

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Thu, 01/18/2018 - 12:24
Henk4U2
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ZoomieFan wrote:
Capacity is a little less than I hoped for. Any idea what's the difference with "this":https://www.imrbatteries.com/samsung-48g-21700-4800mah-flat-top-battery/ version?
The color rendering of the IMRbatteries website. Mine is gray and has the same text as the battery in the picture.
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Mon, 03/26/2018 - 00:51
PERMABattery
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Great Job as always, HKJ! I will show it to our battery pack engineers for reference. Many thanks!

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Tue, 03/27/2018 - 08:15
ferongr
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Wondering whether the 48G would be okay to use for a pulsed, low duty cycle (5 sec. on, 30+ sec. off), 45-50W max. application with a 3.3V cutoff voltage.

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Tue, 03/27/2018 - 08:22
HKJ
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ferongr wrote:
Wondering whether the 48G would be okay to use for a pulsed, low duty cycle (5 sec. on, 30+ sec. off), 45-50W max. application with a 3.3V cutoff voltage.

According to specifications:

Max. discharge current: 9600mA (Not for cycle life)
Max. pulse discharge current: 30A for 10sec, 25A for 30sec, 18A for 60sec

It looks good enough (I would expect double current needs four times the cool down time, i.e. 25% duty cycle at 2×9.6A)
But is would not guess on cycle life.

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Tue, 03/27/2018 - 10:23
Satan@103TFS
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Since GB is only practical place I can order battery wonder is this the same as SS 48G https://www.gearbest.com/batteries/pp_824699.html?

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Tue, 03/27/2018 - 17:21
Agro
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Said to be the same. But as with most rewraps you won’t know until it arrives.

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