Subohmcell Battery
I was tested at a constant current ranging from 10A to 25A. This particular cell was acquired from IMRBatteries and generously provided for testing purposes. To avoid any confusion with eGo-type "batteries," I utilize the term "cell" here to denote a single 18650, 26650, and similar types.
Disclaimer
My subjective viewpoint is the deductions and suggestions I formulate based on these tests. Before making any purchases, you must diligently research any battery you consider.
Conducting tests on batteries near their limits is exceedingly hazardous. It should never, under any circumstances, be attempted by individuals lacking comprehensive knowledge of the associated risks and effective mitigation strategies. The safety measures I have adopted are those I have personally chosen, and it is important not to assume that they will safeguard you if you engage in any testing activities. Conduct thorough research and establish your own testing methodologies and safety precautions.
Subohmcell 18650 Battery Key Point
This is only a 15A+ cell, possessing nearly 40% less capacity than the Samsung 25R when operated at 20A. Furthermore, like other best 18650 batteries, it exhibits significantly higher temperatures during operation compared to the 25R.
Observations
At 10A, it attained a slightly higher capacity of over 2300mAh. This represents abysmal performance for a cell rated at 2800mAh. Consequently, I am setting the power of this cell at 2500mAh like the MXJO 18650 2500mAh.
At 20A, the maximum temperature reached 86°C. This remarkably high value indicates that the cell is already operating beyond its continuous discharge rating (CDR).
At 25A, the temperature rose to 99°C just before the completion of the test. Subsequently, the temperature steadily increased to 101°C. This surpasses my safety limit of 100°C, proving that this is not a 35A cell.
Tests were not conducted at 30A or 35A since my safety limit had already surpassed 25A. I believe there would be a genuine risk of cell venting at these elevated current levels.
After five additional cycles at 20A, no discernible loss in capacity or other voltage sag was observed. However, the temperature remained excessively high to establish 20A as the CDR.
I am setting a CDR of 15A+ for this cell. Although it was not damaged at 20A, its temperature is too elevated. At 15A, the temperature matches that of the 25R at its CDR. While operating any cell near its maximum rated current level causes damage, I anticipate good cycle life from this cell at 15A+. I do not recommend using this cell above 20A due to the elevated temperatures it reaches and the associated risk of venting.
To explore how other cells have fared in testing and determine their safe operational limits, please refer to the links provided in my signature.