Thank you Susan~S, I should have mentioned that. I am aware of the 20A continuous amp rating. I still get better life out of them than my vtc4s. They are actually re-labeled lg18650he2 batterys, I have one of those as well. The advertised amp rating is 35 amps, which is the pulse rating. I think it is wrong that they advertise them as being 35 amp batterys, they should have labeled them as 20 amp batterys, but the price is right, they fit my needs very well, and you don't have to dig very far to find out that they are really only rated at 20 amps continuous. Still a decent battery unless you are doing crazy sub ohm builds. For a dna 30 device, the 20 amp limit is plenty high enough, actually the new vaporshark rdna with the dna40 chip comes with the Lg18650he2 (same battery as the 2500mah purple efest) . When building I use
www.steam-engine.org for the coil wrapping calculator, but I also use the battery calculator as well, I just make sure to put the Lg18650he2 as my battery preset when using the 2500mah efests. With a dna 30 device you don't really need to worry about the battery calculator as long as you are running batterys with a decent continuous amp rating (I believe a dna 30's max current output is 10 amps) , but if you get into mechanical mods at any point it is there and is a great tool. Once again, be careful when buying Sony batterys, there are fake vtc4s and vtc5s all over the place.