The only 510 threaded stuff I ever recall using was the FIN mini "cig-alike" type e-cigarette batteries and cartomizers that can be bought locally on a retail level at Walmarts, truck stops, gas stations, and probably from several other places nowadays as well. They were actually okay for what they were, but you'd probably want something in a 510 threaded fat battery - which there are oodles of sources for online, as well as a plethora of cartomizer, tank and clearomizer options. Unfortunately, automatic fat batteries in 510 or nearly any other threading are a lot less available, with much, much fewer size and color options - unless you buy from overseas.
Right now, I'm still using the 808D threaded Halo Triton 400mah fat batteries I got to replace my original ECHO gear. They are manual button operated, with unfortunately no automatic option available. Their clearomizer tanks work very well, are easy to maintain, and have relatively cheap replacement coil assemblies available at 3 different resistance range levels. I've yet to have to replace any of my original Triton clearomizer bodies, but have gone through about a dozen wick/atomizer coil assemblies over the last few months. They are about $2.50 each, sold in 6-packs.
I've also tried the SI Volt Mini T3 clearomizers, which are of compatible 808D threading with the Triton batteries. They are bottom coil instead of top coil, and are a bit shorter, with a smaller e-liquid capacity, but are also good performing clearomizers. Overall I prefer the Triton clearomizers, which are just an 808D threaded Kanger model that is normally 510 threaded. This is mainly because the Triton replacement coil assemblies are a little cheaper, and seem to last a little longer before needing to be replaced. Both give good vaping performance - with no significant leakage issues. The shorter Mini T3 is nice from a size perspective, and it is as easy to refill as the Triton tanks, but that is its only real advantage to me. There is also a larger capacity, longer, "regular" size SI Volt T3 clearomizer, but I have heard it has more issues with leaks - though I haven't actually confirmed that myself, having never tried them.
The Triton batteries are real champs, but I understand that the SI (Smokeless Image) 808D threaded fat batteries (which do have longer automatic versions available) are also very good. My manual Triton 400mah batteries have outlasted my old ECHO 350mah (or was it 300mah?) batteries in general durability and charge retention, so I'm pretty satisfied with them. The 400mah Triton batteries are shorter than a 650mah ECHO battery (which is what I used to normally use before). With the longer Triton clearomizer tank attached, the length is very similar to what I had using an ECHO setup, with either a clartomizer or clearomizer attached. It is shirt pocket friendly size which I like quite a bit. Not too small. Not too large. Even a short 400mah Triton battery provides a few hours of vape before needing a recharge. They are small, so carrying charged spares is no problem, and they recharge in only about 90 minutes - while they can last nearly twice that long at a fairly normal (for me) vaping level. Of course, larger size Triton (and SI Volt fatty) batteries are also available, including 650mah, 900mah, and I forget what else (up to like 1600 or 1800mah, I think).
Admittedly, the Triton and the big SI Volt batteries are not 510 threaded. So, if you still want to go the 510 route (which there is nothing wrong with), I suggest you ask the folks that are really into 510 threaded gear. They would probably know a lot more about it than many of us here that still fondly remember the ECHO automatic, and wish it weren't fading away so rapidly as it appears to be.
