Ok. Thanks for the info.. I will just stick to a standard eGo. What attys last longer, the standard 510 or tanks? I'm currently using a ec502 kit I just bought today, I had a smoke51 a while ago bit the shop I was at quit selling them so it got shelved and I went back to ryo analogs

... the s51 was crap but the batteries were great, they lasted all day on a charge.
Hey I had a 51 dou too, i hate those guys now....
The standard attys are easier for me to clean than the tank attires, but the tank system is way more convent to use when away from home, because a couple of back up tanks travel so well.
The tank attys are basically the regular attics with a Needle-Wick shoved in them, but the wicks can get clogged over time, and it is really difficult to get flavors out, so attys usually become unable before they burn out. Even if you clean them regularly with a steam-cleaner.
To me it's worth the extra atty or two I buy every couple of months for the convenience of the tanks. If you are looking at ego-batteries, Why not check out the ego-t atty instead of the 510-t att, it holds twice as much juice, just an option you might want to look at it.