I've used an XTar VP1 for the past year or so. Nice charger, with 3 charging levels, and a digital LED screen. But, the sliders have always been a bit stiff. I recently acquired a Nitecore Intellicharger, as a raffle prize at a vape meet. Much nicer sliders than the XTar. So, I alternate between the two. Just whichever one I grab first.
As for batteries, I'd been using VTC5s in my tube mods, and I like them, especially in mods that adjust for battery length, and the switch throw remains constant, such as the Nemesis, GP Paps, Roller, Stingray, etc. So, when I got my first Reo, I naturally began by using the VTC5s. But what I found was similar to what was posted earlier. The VTC5s would become finicky, with some minor arcing, and oxidation on the contacts. Plus, I wasn't happy with the long throw of the switch because of the flat top batteries. So, I tried a couple AW button tops I have had for a while. I was a lot happier with the shorter button throw, and they didn't seem as finicky. I stopped by one of our local B&Ms, and the only button tops they had were some purple Efests. I picked up 3 of them. They are working very well. Next time I order batteries, I think I'm either going to get the purple Efests again, or the AW 1600 mah.