In my 1x18650 flashlights I use most of the time Panasonic NCR18650B 3400 mAh (protected) and Efest IMR purple button top 3100 mAh.
As from my observations, Panasonic don't have a better marginal capacity. Efest can handle a lot better 2,5-3 Amp discharge (when I run on full power single 18650 XM-L flashlights) , it has a higher voltage to high currents, and is half a price of Panasonic.
The only thing which remain to see (beside the fact that Panasonic is protected), is the lifetime in next 1...2...3 years. After 1 year I must give a big plus to Efest IMR 3100 mAh, a very good cell for the price I paid.
PS: also I run my Acebeam K60 with Efest purple IMR 3100 mAh, good runtime, constant power till end.
As from my observations, Panasonic don't have a better marginal capacity. Efest can handle a lot better 2,5-3 Amp discharge (when I run on full power single 18650 XM-L flashlights) , it has a higher voltage to high currents, and is half a price of Panasonic.
The only thing which remain to see (beside the fact that Panasonic is protected), is the lifetime in next 1...2...3 years. After 1 year I must give a big plus to Efest IMR 3100 mAh, a very good cell for the price I paid.
PS: also I run my Acebeam K60 with Efest purple IMR 3100 mAh, good runtime, constant power till end.