It surprises me how someone can get an all day vape from their batts when sub ohming. I must have a bad batch because if I vape @ .4 for 20mins I get drop off, a lack of kick and back in the charger they go
Huh, in all of the devices I have (I am a small retailer, so have many) I will get about full day (sometimes, if changed at night can last the whole next day and into the following one) in the 30-40 watt range on a dual 0.4 ohm coil. Seems to be the case whether using a purple eFest, Samsung 25R, LG HB2, AW or MXJO. However, with the SMOK TFV4 with the triple coil powered by IPV D2, ONLY the LG HB2 will fully fire it in the 65-70 watt range. However, when using (2) LG HB2 or (2) purple eFest high discharge batteries I can run that tank set-up for 1.5-2 days...just an example of the unique characteristics batteries can hold.
On a separate note, I have heard that all 18650 batteries are made from just a few companies like Sony, Samsung, LG and Panasonic. All of these companies allegedly create a multitude of different guts for the case, therefore smaller companies buy the certain model that fits their price point and re-wrap it. The big thing is that the "mAh" rating does not necessarily mean longer firing. The one thing that is for sure is that amp ratings when done a a "pulse" rating can be very deceiving. It is wisest to get a true 25+ amp constant discharge battery and there are not a lot that truly have this feature, anfd apparently only ONE, the LG HB2 that has a 30 amp constant discharge making it potentially the safest for low sub-ohm vaping especially.
Something folks sure try to wrap their head around is that the higher the (true) amperage the lower the mAh. You just can't have a "TRUE" 3200mAh 35 Amp 18650 battery. Higher the amp, lower the mAh; higher the mAh, lower the Amps, no way around it....however, this is a strong case for the use of 26650 batteries, I wish the IPV D2 used one... they could have made it another half centimeter thick!