Test/review of Keeppower 18650 3120mAh P1831R (Black) 2017

4 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 1 hour 21 min ago
Joined: 05/24/2011 - 12:23
Posts: 6981
Location: Copenhagen, Denmark
Test/review of Keeppower 18650 3120mAh P1831R (Black) 2017

Keeppower 18650 3120mAh P1831R (Black) 2017
DSC_2629
Official specifications:


  • Part No.: P1831R
  • Protected 18650 Li-ion Rechargeable Battery
  • Minimum Capacity: 3000mAh
  • Typical Capacity: 3120mAh
  • Normal Voltage: 3.7V
  • Maximum Continuous Charging Current: 5A
  • Maximum Continuous Discharging Current: 15A
  • In Built Safety Circuitry
  • Protection Circuit (Against over charge, over discharge, over current and short-circuit.)
  • 4.20V maximum voltage and 2.50V cut-off voltage
  • Over 500 charge-discharge cycles
  • Max. Size: 18.8 × 69.0mm
  • Weight: 48g
  • Max. 15A Continuous Discharge Current

Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-info
A protected battery that can deliver a lot of current and has good capacity.
DSC_2628
DSC_2630 DSC_2631
DSC_2632
DSC_2633
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Capacity
The discharge curves tracks very fine.
The B battery jumps a bit in voltage, it looks like a loose connection in my test setup.
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Temp-10.0
A full discharge at 15A is a bit much for this battery, it gets rather hot. I had to stop one of the discharges.
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Temp-15.0
At 15A I had to stop both discharges due to temperature.
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Temp-20.0
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-CapacityTimeHours
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-CapacityTime
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Energy
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-PowerLoadTime
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-TripCurrent
Keeppower%2018650%203120mAh%20P1831R%20(Black)%202017-Charge
Conclusion
This is a good cell, but the build in protection do not trip on overload (It will probably trip on higher currents).
Notes and links
The battery was supplied by Keeppower 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

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

AndyMac2272
AndyMac2272's picture
Offline
Last seen: 3 days 18 hours ago
Joined: 06/12/2019 - 19:57
Posts: 8
Location: New York

I just purchased 4 of these batteries. Question: Would it be ok to use them in a Thrunite TN42? 

AndyMac222777

d_t_a
Offline
Last seen: 6 hours 18 min ago
Joined: 08/04/2017 - 23:58
Posts: 1467
Location: Manila, Philippines
Quote:
This is a good cell, but the build in protection do not trip on overload (It will probably trip on higher currents).

I wonder at what possible current will it trip?
Also, having a protection circuit adds a bit of resistance, isn’t it?

HKJ
HKJ's picture
Offline
Last seen: 1 hour 21 min ago
Joined: 05/24/2011 - 12:23
Posts: 6981
Location: Copenhagen, Denmark
d_t_a wrote:
Also, having a protection circuit adds a bit of resistance, isn’t it?

Yes, protection add a small resistor to measure current. The resistor is the on resistance of the mosfets.
Usual the chip will trip when the voltage drop is in the 0.1 to 0.2V range across the mosfets, the exact voltage depends on the chip (A often used chip DW01 is 0.15V).

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