Hey guys, I'm both new to this forum and new to RDTA vaping. I have an Aspire CF Mod with a Samsung ICR18650-26F rated at 2600 mAh, 3.6-4.2 volts. I believe (though I'm not completely sure) that the Aspire CF is a 40 watt mod. I just bought the Aspire Quad-Flex Survival Kit and set up the RDTA included in the package. This was the first RDA I've ever set up and it works fantastically, I have no problem with resistance (Pre-Built Clapton Kanthal on a dual-coil deck, 0.8-0.9 ohm each) but my battery seems to die inordinately quickly. I don't have an omnimeter or multimeter so I have to play my battery's charge by ear. I bought a brand new battery today to replace what I assumed was a dead cell and after it killing it and giving it a 4-hour charge, it lasted maybe 45 minutes tops. I then gave my older battery a 4-hour charge and it lasted maybe 20 minutes. I'm not sure what to do about this or what the source of the problem is. I may go to my local Vapor Gurus tomorrow to ask around there but I wanted to post here to get as much info as possible. Any help would be appreciated, thanks! TLDR; Samsung ICR18650-26F dying on a full charge in 30-45 minutes. Using an Aspire CF Mod with a Nautilus X RDTA.