Out of my last tests of new cells trustfire flames 2500 mAh average, solarforce 2200 mAh average, hi-max 2570 mAh average, redilast 2500 mAh average with discharge of 0.5 amps, xtars lower then all these.
For 3 amp discharge im getting trustfire flames 2100 mAh average, solarforce 2100 mAh average, hi-max 2300 mAh average, redilast 2400 mAh average
My low voltage is close to 6 volt loaded over 2 cells on a couple of my torches, 3 volt on some of my single cell lights and my direct drive lights to torch is well dim by 3 volts, this is all loaded voltage, the cells will climb back up in voltage once rested and is not really relevant as loaded voltage is where they are ended up discharged and the rested voltage would soon drop once reloaded.
It all depends if the driver is regulated, boosted or buck and direct drive as this will give diffrent results but the batteries either way are not very usible at all past 3 volts per cell as the light either will be dim, or droped out of regulation or go into low voltage protection by dimming or cutting off depending on the light.
With the panisonic 3100 mAh they are rated from 2.5 volt to 4.2 volt to me usible voltage is 3 volt maybe a bit higher in reality, so they should give around 2700 to 2800 mAh between 3 to 4.2 volt, so basicly your paying 300 % more a pair for an extra 300 mAh, its up to the buy to decide if its worth the extra 300 % $$$ for the extra 300 mAh.
This is why i brought the redilast 2600 as the usible voltage 2.75 volt to 4.2 volt as i felt they had more usible voltage over the redilast 2900 and 3100 and since the redilast are panisonic cells i feel it will be the same for other sellers of the panisonic cells.
If they buyer is willing to pay the extra 300% for better cells i suggest the redilast 2600 they should have better pcb,s and better customer service and faster shipping.
My battery test sofar.
18650 Hi-Max 2600 mAh battery test
panisonic 3100 mAh test yet to come.