iJoy 26650 4200mAh 40A --overrated--only good for use at 30A but good battery for @$10.50 each -- from test results :
https://www.e-cigarette-forum.com/forum/threads/ijoy-40a-4200mah-26650-bench-test-results-overrated-but-a-great-30a-battery.764411/
"Bottom Line: This iJoy cell's 40ah rating is exaggerated. This is incredibly frustrating because it's the first 30A 26650 I've ever tested and no exaggeration was needed! Why the hell do companies like iJoy still think they need to do this to sell batteries?
This is the first 26650 I've tested that acts like an 18650. Its internal resistance is lower than many of the good 18650's and it held its voltage well. At 30A/100W pulsed it ran approximately 75% longer, and 0.15V-0.20V higher, than the Basen and Brillipower 4500mAh cells down to 3.2V. It doesn't match the appearance of any other 26650 I have so I don't know where this cell came from. I am giving this cell a maximum vaping amps (MVA) rating of 40A but the voltage sag is getting pretty bad at this level."
"Comments
•At 10A continuous it reached about 4100mAh. This is good performance for a 4200mAh cell at 10A so I am rating this cell at 4200mAh.
•At 15A continuous the temperature rose to 52°C. This is way below the average temperature of a cell operating at its continuous discharge rating (CDR) and is an indication that we are operating way below its true rating.
•At 20A continuous the temperature rose to 59°C. This is still way below the average temperature of a cell operating at its CDR and is an indication that we are operating way below its true rating.
•At 25A continuous the temperature rose to 69°C. This is still below the average temperature of a cell operating at its CDR and is an indication that we are operating below its true rating.
•At 30A continuous the temperature rose to 77°C. This is just below the average temperature of a cell operating at its CDR and is an indication that we are operating at its true rating.
•At 35A continuous the temperature rose to 83°C. This is above the average temperature of a cell operating at its CDR and is an indication that we are operating at above its true rating. The voltage is sagging a lot.
•At 40A continuous the temperature rose to 85°C. This is above the average temperature of a cell operating at its CDR and is an indication that we are operating at above its true rating. The voltage is sagging a huge amount.
•I am setting a CDR of 30A for this cell. 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 30A continuous"
