Well, there is more to battery safety than just checking your wrappers. that's good to do that but also, with those subohm tanks you want to make sure to use the 510 topap on your mod not the Hybrid connector. be sure to use good batteries, and don't overload them ie-ohm'd law. No one is jumping your shit, but, we gotta look out for each other.
Those hybrid connectors on mechs turn a subohm tank into an ignition system for an icbm
Now, back your tank quest, for a subohm tank I use the silo beast from beyond vapes and thru eclipse from science of vaping both with either the Atlantis triton coil or eleaf ni200 coil. the uwell comes very highly recommended, but fir never used one. I would however, highly recommend the triton.
Best of luck and vapes safe