Samsung INR21700-48G 4800mAh (Gray)/DSC_2593.jpg)
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)
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This is a high capacity cell in the new 21700 format.
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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.
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/Samsung%20INR21700-48G%204800mAh%20(Gray)-Temp-10.0.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-Temp-15.0.png)
Battery gets to hot and i stop the discharge.
/Samsung%20INR21700-48G%204800mAh%20(Gray)-CapacityTimeHours.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-CapacityTime.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-Energy.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-PowerLoadTime.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-TripCurrent.png)
/Samsung%20INR21700-48G%204800mAh%20(Gray)-Charge.png)
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/
Excellent work as always HKJ, thanks!
4800 is pretty impressive!
The Eneloop 2005-2018 info thread
very nice cell, thank you for the detailed review.
I think I will try to bore out a light to try a 21700.
New review: Wuben TO40R XPL2 18650
Thanks HKJ.
My current and or voltage measurements are only relevent to anything that I measure.
Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife.
djozz said "it came with chinese lettering that is chinese to me".
old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".
Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.
That was a long wait….but thanks for the test, great as always.
Yes and my queue is still very long.
My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/
Thanks for the review! I’m hoping to see multi 21700 lights soon.
-USB power meter/tester thread - YZXStudio, Power-Z, AVHzY, Kotomi, Ruideng
Always charge my batteries at 0.5Amp (when not in a hurry
).
Thanks for the review!
I always think long and hard before I say something really stupid.
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.
Size
My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/
Capacity is a little less than I hoped for.
Any idea what’s the difference with this version?
Chargers: 1xBasen BD01 5/5,1xDodge Charger, LiitoKala: 3x100 4/5, 2x202 5/5, 1x402 3/5., MiBoxer C4-12 3/5
Flashlights: BLF Q8 4/5, Convoy BD04 5/5, DQG Tiny III, FiTorch MR35 3/5, Haikelite SC26 HD, Zebralight H600Fc 3/5.
Powerbanks: EasyAcc 26800 mAh 3/5, Xtar PB2 4/5
Waiting for: 21700 EDCs to hit the market.
I always think long and hard before I say something really stupid.
Great Job as always, HKJ! I will show it to our battery pack engineers for reference. Many thanks!
Custom Battery Pack Solutions
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.
My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/
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?
Said to be the same. But as with most rewraps you won’t know until it arrives.