Oh and duh I am not reading well today. If your Vgo is 510 threaded then a real Joye Ego should be able to share its charger AS FAR AS I KNOW.
And what I said above stands for those other batteries. 510-T chargers are weird and are only for 510-T. Slim normal 510 chargers sometimes do not have a big enough opening for the fat collar of the big battery models, and also only put out 150 to 200mA for charging whereas an Ego charger cable puts out 420mA. That is the same reason you cannot charge a slim 510 on an Ego charger - it will degrade and damage the slim batteries (happened to me - a vendor sent me an incorrect charger cable in my first 510 kit and it damaged 4 slim 510 batteries before I spotted it was not the right cable). As for reverse polarity clones (FS510, and at least one Ego too - Ego-J or something) will electrically fry in a normal charging cable and vice versa. Attys and cartos don't care about polarity.
I do not know for a fact that Vgo is the same polarity as real Joye Ego but I have not heard of any problems like that. its charger is probably fine for a REAL Ego. I am not saying anything about any clone Egos - caveat emptor. I do know the Liberty Flights Riva 510's are the same polarity as a real Joye Ego.
BTW if your Vgo is a real 3.7v devices, the Ego will run things a bit cooler. Ego is not 3.7v (more like 3.3v).