Lots of mods that take removable batteries allow charging via USB directly to the device. I don't know the pros/cons of this as I don't have one.
I do have an istick 30 that has been my main vape for a while. I would definitely try the iStick 50 if it is similar, these things have withstood every kind of abuse I could throw at them. And I throw a lot of abuse at them.
I just ordered a Hanamodz V4m to use as I start exploring rda's. I think there are cheaper units that can be had with a lot of the same features but it's made in the USA so that's cool![]()
Most regulated mods do have USB balanced charging. Its frowned upon here in ECF but honestly I do it sometimes when I'm traveling or out and only have a usb cord/ wall charger.
I would not skimp on batteries however.