SVD vs Vamo V3 and battery usage

So i picked up a SVD the other day and got my Vamo V3 (Ego bamboo) a couple days afterwards. Im noticing a pretty severe difference in battery life between the two. Im using two new 18350's, one in each, with a Kanger evod, both same resistance and voltage settings. Now im not counting puffs, but for two days straight, the SVD battery is dying probably 40% faster than the Vamo. Day 2 I switched batteries on the two and got the same results. Im not knocking either device, but cant figure out why the SVD would burn through batteries so much quicker than the Vamo. Has anyone else experienced the same?