I tested my first set of batteries on my Opus (3100 v2.2 I think) charger. The cells are Japanese made Panasonic NCR18650PF cells with a 2,950 mAh and 10 A discharge rating. The results I got we're between 2,800 and 2,850 mAh and internal resistance from 69-74. That was done in an unheated room probably around 40° f last night with my charge rate set to 1,000 mA and I think discharge was set at 700 mA. I'm not sure if the cold temp would have screwed up the results, if the internal resistance measurements are good for a Panasonic cell or if the results on my Opus charger are accurate.
I keep seeing people measure cells at higher than spec, I was really hoping to see 3,000 mAh but now I'm slightly worried that I have degraded or counterfeit cells.
Does the internal resistance seem ok? If cold has an effect on measurements, how much could that be off? How accurate do Opus charger test results seem to be?
I figured with a 10 A rating I should test at the highest charge and discharge rates possible (with 4 cells in the charger). I didn't babysit it so I'm not sure how long it took or if the cells got hot at all. If anyone knows how long I should expect, let me know.
I keep seeing people measure cells at higher than spec, I was really hoping to see 3,000 mAh but now I'm slightly worried that I have degraded or counterfeit cells.
Does the internal resistance seem ok? If cold has an effect on measurements, how much could that be off? How accurate do Opus charger test results seem to be?
I figured with a 10 A rating I should test at the highest charge and discharge rates possible (with 4 cells in the charger). I didn't babysit it so I'm not sure how long it took or if the cells got hot at all. If anyone knows how long I should expect, let me know.