I recently picked up a single 18650 DNA40 regulated squonker & using the Samsung 25r or LGHG2's the weak battery warning is coming on at a little under the half battery life indicator on the mod. The part that I am confused about is the voltage is only 3.6V at that time. All my batteries are about 2-3 months old so I can't see how they are the problem. My builds are simple 28awg dual coil 1.0 ohm builds & I usually vape around 32 watts so I'm barely getting 2-3mls of use before the weak battery warning is flashing. The LGHG2's are about the best battery out there right now from all testing so I'm trying to see if it's a chip problem or battery concern with this particular unit.