Test/Review of Aucooma IMR18650 3000mAh (Black-red)

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HKJ's picture
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Location: Copenhagen, Denmark
Test/Review of Aucooma IMR18650 3000mAh (Black-red)

Aucooma IMR18650 3000mAh (Black-red)
Official specifications:

  • Nominal Capacity: 3000mAh
  • Nominal Voltage: 3.70V
  • Standard Charge: Constant current 1250mA, Constant voltage 4.20V, End current(Cut off) 50mA
  • Fast Charge: Constant current 4000mA, Constant voltage 4.20V, End current(Cut off) 100mA
  • Max. Charge Voltage: 4.20V
  • Max. Charge Current: 4000mA
  • Standard Discharge: Constant current 500mA, End voltage(Cut off) 2.5V
  • Fast Discharge: Constant current 35A, End voltage(Cut off) 2.5V
  • Max. Discharge Current: For continuous discharge 20A, Max discharge 35A
  • Weight: Approx. Max. 47.0G
  • Operating Temperature: Charge 0 ~ 50°C, Discharge -20~ 75°C,
  • Storage Temperature: 1 month -20 ~ 60°C, 3 months -20 ~45°C, 1 year -20 ~ 20°C
  • Dimension: (D)18.2 + 0.2/-0.3 mm, (H) 64.85 ± 0

This is high current and high capacity cells.
DSC_4213 DSC_4214
DSC_4216 DSC_4217
The discharge curves tracks very well and the cell is good at handling current, but they do get very hot at 20A current.
Remember this is temperature raise, to get the cell temperature somewhere between 25°C and 30°C must be added.
At 20A the cells reach 85°C and I stop the test.
At 30A the cells reach 85°C much faster, after I stopped the test my sensor reached 92°C
The cells has good capacity and can deliver a lot of current, but high current is best done in pulses to keep the temperature down.
Notes and links
The batteries was supplied by Aucooma for a 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/

MRsDNF's picture
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Location: A light beam away from the missus in the land of Aus.

Thanks HKJ. 92°C, that is hot.


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Henk4U2's picture
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Thank you for another thourougly conducted series of tests and review.
Apparently there are more things in heaven and earth, Horatio, than just the Big Names Wink
A quick look in your comparator reveals that the results of this battery are almost identical to those the Samsung 30Q.

You are a flashaholic if you are forced to come out of the closet, to make room for more flashlights.

Tom E
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Last seen: 3 days 16 hours ago
Joined: 08/19/2012 - 08:23
Posts: 15042
Location: LI NY

Thanks HKJ! Yes, dead ringer on the discharge curves with a 30Q at every level.