battery charger by dtap

I know that is a very dumb question, but i learn that there are too many wrong way to the things, and want to avoid to burn a 200$ battery...
I have gmount battery, and now i have a way to use also vmount battery, i just have gmount battery charger, then another kind of battery is also a new battery charger, or... today i seen on amazon a battery charger to connect by dtap ...
https://www.amazon.com/D-Tap-Travel...8&qid=1518880036&sr=8-1&keywords=dtap+charger
here told that work with any vmount gmount battery with Dtap.
my dumb question is : EVERY dtap port is In and Out voltage at same time? or there is situation where a dtap is Output voltage only?
my fear is that i connect a battery by a dtap to a charger and fry them.
 
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