if the vv ego batt works anything like the ego booster, using lr defeats the purpose of raising the voltage. from what i understand, using LR also "lowers the voltage" (i know it's more complicated than that). but in laymens terms, if you use a sr device on it at 4.2v, you'll get close to that. if using an lr device, you'll get less voltage, let's say, around 3.7. all that depends on the ohms of the cartos and the voltage being put out. but this is just to give you my version of a general idea for how the ego booster works with sr and lr cartos. so this might be the same for the vv ego batt, it may not, i don't know. just wanted to give you a heads up on that though, as i'm pretty sure everybody who uses higher than 3.7 voltage uses sr or even hr cartos.
**edit** one more thing, from what i understand about dual coils, is that they already lower the ohm-age since there's 2 coils. so having a lr dual coil is like, doubly lr, which would make it even worse?
