I love the skinny 510 batteries. If I didn't want something that travels better (5-click on/off to throw in a purse), I would use them a lot more often.
The original little 180 mah batteries were way too irritating to use, even if I'm sitting right next to a charger and can switch them out easily. But, the 280 mah+ are great!
So, the batteries that come with a 510-T kit are great. The 510-T atomizer/tank system is good too but has it's issues.
When I first got mine, I was getting dry hits because the tank wasn't feeding juice fast enough. I would take off the tank and drip a few drops directly into the atty then replace the tank and keep going for a while. I eventually just replaced the tank with a drip tip and started using the atty for dripping instead. From what I understand, if you fiddle with the airflow channels on the side of the tank to get the airflow just right, the tank will feed juice just fine. I don't know. I never got that far because I've always preferred to drip anyway.
You can also use a regular 510 or 306 atty on any 510 battery. As long as you keep the resistance in the standard range. A standard resistance 510 is 2.5 ohm. A standard resistance 306 is 2.2 to 2.5 ohm depending on who you talk to and where you buy it. A 2.2 to 2.3 ohm 306 with drip tip is the best combination of throat hit and flavor IMHO.
Cartomizers on a 510 battery were a problem for me. The standard resistance Boge 510 cartomizers don't give enough flavor or throat hit for me. But, the lower resistance 2.0 ohm cartomizers are a strain on the little batteries. They're more suited to an eGo battery. Many people use that combination anyway. But, you're little batteries will need to be charged more often, and their lifespan won't be as long. If it's worth it to you, it's very satisfying combination.
Then there are the Nano clearomizers. I just bought some. Haven't tried them yet. But, they're designed for the skinny 510 batteries, and I've heard good things about them. If you're interested, I'll come back and let you know how they work for me once I've tried them.
CE2s and CE3s are also popular on the little batteries. I hate the CE2s personally. I hate the flavor. The CE3s have tons of vapor and are known for having good flavor. But, mine tasted nasty. So, I've washed it out to see if maybe there was some kind of primer in it that was making it taste bad. I'm getting ready to try it again. So, I'll soon find out if they deserve their great reputation for lots of flavor.
I hope that helps.