Though I'm not entirely sure it works as a true passthrough (some devices supposed to be passthrough really aren't - you're still using the battery and not the outlet for power, but you can charge while you vape), the cropduster mod has a ni-mh flat pack battery built in and comes with a charger you plug in to the mod.
EDIT: I need to pay better attention to what I read. You asked for VV mods with passthrough... the cropduster is 4.8v and not VV. Sorry.