They have a long duration compared to the vtc6 that I have in another electronic device, I didn't expect such a difference between 3000mah and 4000mah! I have them in a DNA mod at 85 watts in watt boost mode, which initially draws 29.3 amps and then drops to 25.4 due to the watt boost. It didn't show me a weak battery on the mod like it does with the vtc6! My charger doesn't show the mah of a battery, but it discharges at the same voltage for all. Overall, they are very powerful in terms of capacity and amp.
After 1 month, I have to say that I was amazed! The batteries are at 5% with 3.4 volts and still produce the same power as when my other 18650 batteries were at 15-20%, where I would see them drop to 7% and know that they were depleted, but with these, I know they still have power. I leave the house with 50% and don't worry, whereas with vtc6/lg, etc., I would change them at 50%. I mentioned earlier the 29.3 amps and in a single battery DNA mod where I installed them, they perform normally. I hope they never change their quality like other 18650 batteries