Molicels are highly rated batteries. That's what I use.
@Mooch here on ECF has a list of batteries on his blog he has tested himself. All different sizes and power characteristics. He gives all the details you are looking for. Molis were his top pick last time I looked.
The warnings about using batteries for vaping are written by company lawyers to protect themselves from lawsuits if a vape catches fire or something. Most batteries carry that warning now, doesn't mean anything.
There are a lot of fake batteries around though. There are reliable sellers out there who verify their batteries before they sell them. Buy them from Temu or ebay and you have no idea what you are getting. Where do you shop for batteries?
I recently got a new charger. It's a Vapcell S4. It came with a power cord. Lots of features, diagnostics and so forth. Automatically decides how to charge what you put in it, unless you want to do that yourself. It never got uncomfortably warm on me. I used XTAR for years but had problems with screen fading. There are plenty of good chargers around these days.
Other than that, all I ever use is single batt 18650 mods so I don't know about anything else.
Noticed you joined ECF a month after I did. Welcome back.