Test/review of Golisi IMR18650 2600mAh S26 (Black)

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HKJ's picture
Last seen: 8 hours 40 min ago
Joined: 05/24/2011 - 12:23
Posts: 6558
Location: Copenhagen, Denmark
Test/review of Golisi IMR18650 2600mAh S26 (Black)

Golisi IMR18650 2600mAh S26 (Black)


Official specifications:

  • Battery type: IMR 18650 high drain battery, Pro series
  • Apply to: e-Cigs
  • Nominal capacity: 2600mAh
  • Constant current: 35A
  • Nominal voltage: 3.7V
  • Discharging cut-off voltage: 2.5V
  • Charging cut-off voltage: 4.20±0.05V
  • Internal Resistance: 11mOhm
  • Safety protection: Based on UL1642 standard, no leaking or explosion in extreme tests of over charging, short circuit, over discharging, high temperature
  • Standard charging current: 2.5A~4A. 2A is recommend to extend battery life
  • Fully charged time: Down to 1.3 hours (with GOLISI charger , 2A output?
  • Cycle times: >800
  • Operate temperature: Charging (0 ~ 45°C), Discharging (-20 ~ 60°C)
  • Certificates: CE, ROHS, FCC, MSDS, UN38.3
  • Storage condition: Room temperature, dry place


A 18650 high current battery.





The two cells are fairly well matched in capacity, but not completely, they handle high current discharges up to 20A with nearly constant capacity, but at 30A the output voltage is low and the capacity drops significantly.



The batteries gets hot at 20A, but within the acceptable level.


The temperature is very high at 30A, that is bad for the cell.


A extra look at the cell confirms it got damaged, it vented due to the high temperature.





This curve is done after the first test and the damaged battery has reduced performace.


Here the difference between the two cells are again significant, one measures 0.04ohm and the other 0.08ohm,



A acceptable high current cell, but the 35A rating is too high.

Notes and links

The batteries was supplied by Golisi 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/

Last seen: 21 hours 5 min ago
Joined: 06/26/2013 - 16:16
Posts: 215
Location: Germany

Rated for 35A continuous discharge, but venting at 30A already.

This somewhat shows what to think of the claim “Safety protection: Based on UL1642 standard, no leaking or explosion in extreme tests of over charging, short circuit, over discharging, high temperature”.

Barkuti's picture
Last seen: 2 hours 23 min ago
Joined: 02/19/2014 - 14:46
Posts: 3297
Location: Alhama de Murcia, Spain

The performance is nice, like that of Samsung 25R cells, pity it is advertised with dishonestly exaggerated claims.

This cell is probably manufactured by Shen Zhen Yong Deli


Cheers Party

P.S.: Henrik, your Samsung 25R tests were done on your old test setup and probably with early versions of the cell, they clearly do not reflect the performance of nowadays 25R cells (hint: Mooch's 25R6 review)

Sofirn C8T and C8F reviews of mine

PMme for a tip Wink thanks