so I took a trip to a local ejuice shop. decided to add an ego passthrough battery to my collection. it's just a passthrough that can be disconnected and used as an actual battery on the go. I love this thing, it is beautiful, sleek, and I just really enjoy it. now my question, the owner of the shop told me that these passthroughs run at 5v when connected to a strong USB, and immediately run at 3.7v as soon as its unplugged. I've been reading alot online about how it's not true and just a false rumor going around about them. I can't notice too much of a difference but it does seem to hit alot better when plugged in. I've also read that these are in fact 5v when plugged in so I'm a little confused and not sure what to believe with these. some input would be great. thank you