I seem to have to refill my cart about every 10-15 hits. I just got the Janty Ego and my friend got the joye 510. His hits perfect every time and mine hardly ever hits as good as his yet we both use the same 510 style atty... I don't know if mine is just burning up the juice to fast or if that is normal but his joye 510 last way longer than mine when it come to the juice in one cart. I really don't like the Ego I so wish I would have bought a Joye 510.