hi breakfastchef
to put it another way i am satisfied with my batteries now fresh out of the charger...i love my flavors and am not as concerned with throat hit...i like vapor but what i get from my 510 is enough for me...i want a mod that will last so all i need to get are carts/atomisers/juice. cartomisers and a batt that lasts all day sounds like a dream to me!!!
If you like the 510 and are simply looking for an all day vape with minimal battery switches @ 3.7v then you should look at the eGo. One batt last me 8-10 hours and I am a heavy user. Other have reported even longer battery life.