Test/review of Vapcell INR21700 5000mAh P2150A (Black-purple) 2021

HKJ

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Joined
Mar 26, 2008
Messages
9,699
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Copenhagen, Denmark
[size=+3]Vapcell INR21700 5000mAh P2150A (Black-purple) 2021[/size]

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Official specifications:
  • Model: INR21700 5000mah 10A
  • Size: 21.1*70.5mm
  • Typical Capacity: 5000mAh (0.2C discharge)
  • Min capacity: 4800mAh (0.2C discharge)
  • Nominal voltage: 3.60V
  • Max Continuous Discharge Current: 10A
  • End-of-charge voltage: 4.20V
  • End-of-discharge Voltage: 2.5V
  • Weight: 76g ( Appr)
  • Internal resistance: 28mOhm ( Appr) AC 1kHz?
  • Standard Charge: 1500mA,CCCV 100mA cut-off
  • USB charge model : CC CV
  • USB input power : 5.0v ,>1.0A
  • USB end-of-charge voltage : 4.20V
  • USB CC mode charge current: 1000mA
  • USB CV mode charge current :100mA
  • USB output : 5.0v ,max 1.5A
  • Over charge protection voltage: 4.25+0.1/-0v
  • Over discharge protection voltage 2.50+0/-0.1V
  • Over current protection current: 12A ~ 18A

Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-info.png


This is a high capacity 21700 LiIon battery with USB-C charging input and the USB-C connector can also supply 5V output, i.e. it can work as a power bank.

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There is a multicolored led behind the hole in the plus pole, it is used for charging and power bank functions.

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The two cells tracks nicely and can deliver the rated 10A.

Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-Temp-7.0.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-Temp-10.0.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-CapacityTimeHours.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-CapacityTime.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-Energy.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-PowerLoadTime.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-TripCurrent.png


Vapcell%20INR21700%205000mAh%20P2150A%20(Black-purple)%202021-Charge.png


USB%20Charge%20Test%2020210705205303.png


The battery only increase temperature with about 10°C during USB charging, but the rated 1A charge input current is not correct, it is 1.5A
The USB-C input uses resistor coding to decide between charging and power bank, but it ignores any current rating on the USB-C port.

Discharge-Vapcell%20INR21700%205000mAh%20P2150A%20%28Black-purple%29%202021-pulse-1.0%2010%2010-IR.png




[size=+3]Power bank[/size]

USBLoadSweep.png


USB-C output is rated at 1.5A and can deliver a bit above 1.6A, that is fine.

USBDischarge0.5A.png


At 0.5A load it can deliver above 3Ah, i.e.more than 6 hours of power. It turns output off when battery is down to about 2.9V.

USBDischarge1.5A.png


At 1.5A load it can deliver nearly 3Ah, i.e. about 2 hours of power. I did check the temperature during discharge and it was not more than a 14°C increase at the front of the battery (i.e. the boost converter).

10ohm.png


Noise is 62mVpp and 8mV rms at 0.5A

5ohm.png


Noise is 62mVpp and 8mV rms at 1A



[size=+3]Conclusion[/size]

This battery works fine, both as a battery and as a power bank.

I am not sure that building a power bank into a LiIon battery is a good idea, it would at least require plastic cap to place on the plus pole of the battery when used as a power bank, to prevent any shorts from the plus pole.



[size=+3]Notes and links[/size]

The batteries was supplied by Vapcell 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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
 

john61ct

Well-known member
Joined
Jan 17, 2017
Messages
183
Actually pretty cool idea.

Coupled with PD spec 3.3-21V in 20mV steps output , can you imagine possibilities?

Now, if you could serialize and / or parallel, use the same cells to deliver eBike voltages, or 12/24/36/48V

Just need to rig a 5V charger that can do a few hundred at a time
 

john61ct

Well-known member
Joined
Jan 17, 2017
Messages
183
Just talking about the concept in the abstract.

Of course first implementation of a new category will be limited
 
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