I never got around to buying any Sony VTC5 when they were in stock. I'm still using a pile of Sony VTC4. They last a good amount of time in the sigelei 100w but the VTC5s would last a little longer. I also use the purple efest 2500mah but they're only 20A continuous discharge with 35A burst, I think. I've been considering picking up some LG HE2 but their amp limits might be the same as my purple efest. When I use a .2 ohm coil at 100w I go with the Sony VTC, if I were using a .3 ohm coil or higher at 100w then I feel ok using the purple efest.
I have an Xtar VP1 two bay charger. I would've got the four bay VP4 but they didn't make it back when I got mine, lol. If I were to buy a new charger today then I'd probably get an Efest Luc4 or an Xtar VP4. I'm sure there's other good chargers out there also.