To prevent any confusion with the eGo-type "batteries", I use the term "cell" here to refer to a single 18650, 26650, etc.
Disclaimer
The statements, conclusions, and recommendations I make based on these tests are only my personal opinion. Carefully research any battery you are considering using before purchasing.
Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them.
A note regarding current ratings and my testing
If the cell has only one current rating number on it, or if it says "max discharging current" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuously.
Bottom Line
This Imren is a rewrap with a ridiculously exaggerated current rating. It is identical in performance and appearance to the 20A 2600mAh Sony VTC5. At 27A continuous this cell gets hot enough to boil water. At its 50A rating down to 3.2V it only delivers about 15mAh (fifteen). I am giving this cell a 20A 2600mAh rating but Imren can change what cell they use at any time without telling us.
These cells were donated for the purpose of testing by the Vapor Emporium (The Vapor Emporium).
Continuous-Current Test Results (with VTC5 comparison)
Pulsed-Current Test Results
I'm not wasting the time needed to pulse test this obvious rewrap. See my VTC5 pulse discharge tests to see how well this cell would perform when pulsed, unless Imren changes what cell is under the wrap.
Sony VTC5 2500mAh 18650 Retest Results...a great 20A 2600mAh battery
Comments
List of Battery Tests | E-Cigarette Forum
18350 Safety Grades and Pulse Performance Data | E-Cigarette Forum
18650 Battery Ratings -- Picking a Safe Battery to Vape With | E-Cigarette Forum
26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum
Disclaimer
The statements, conclusions, and recommendations I make based on these tests are only my personal opinion. Carefully research any battery you are considering using before purchasing.
Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them.
A note regarding current ratings and my testing
If the cell has only one current rating number on it, or if it says "max discharging current" then I have to assume that the company is stating that the cell can be discharged at that current level in any way, including continuously.
Bottom Line
This Imren is a rewrap with a ridiculously exaggerated current rating. It is identical in performance and appearance to the 20A 2600mAh Sony VTC5. At 27A continuous this cell gets hot enough to boil water. At its 50A rating down to 3.2V it only delivers about 15mAh (fifteen). I am giving this cell a 20A 2600mAh rating but Imren can change what cell they use at any time without telling us.
These cells were donated for the purpose of testing by the Vapor Emporium (The Vapor Emporium).
Continuous-Current Test Results (with VTC5 comparison)
Pulsed-Current Test Results
I'm not wasting the time needed to pulse test this obvious rewrap. See my VTC5 pulse discharge tests to see how well this cell would perform when pulsed, unless Imren changes what cell is under the wrap.
Sony VTC5 2500mAh 18650 Retest Results...a great 20A 2600mAh battery
Comments
- At 10A continuous it reached about 2500mAh. This is very good performance for a 2600mAh-rated cell operating at 10A so I am rating this cell at 2600mAh.
- At 15A continuous the temperature rose to 71°C. This is a few degrees below the average temperature for a cell operating at its continuous discharge rating (CDR).
- At 20A continuous the temperature rose to 81°C. This is just a couple degrees above the average temperature for a cell operating at its CDR, an indication that we're operating at its true rating.
- At 25A continuous the temperature rose to 96°C. This is a significantly above the average temperature for a cell operating at its CDR.
- At 30A continuous the temperature rose to 109°C. This is way, way above the average temperature for a cell operating at its CDR and is above my 100°C safety cutoff. The voltage is low and sagging a lot.
- At 35A continuous the temperature rose to 119°C. This is a preposterously high temperature for a cell to operate at. The voltage is uselessly low.
- Discharges were done at 40A and 45A continuous, showing the voltage plunging quickly to the 2.8V cutoff.
- A discharge at 50A was done, the cell's rating, and the voltage instantly dropped to below 3.3V. The cell only supplied about 15mAh before dropping to 3.2V. This is clearly not a 50A cell.
- I am setting a CDR of 20A for this cell. Its temperature is the same as the Sony VTC5 operating at its CDR and at the time of my testing its appearance and performance are the same as a VTC5. While operating any cell near its rated maximum current level causes damage to the cell, I would expect decent cycle life from this cell at 20A continuous.
List of Battery Tests | E-Cigarette Forum
18350 Safety Grades and Pulse Performance Data | E-Cigarette Forum
18650 Battery Ratings -- Picking a Safe Battery to Vape With | E-Cigarette Forum
26650 Safety Grades and Pulse Performance Data | E-Cigarette Forum