Originally Posted by LastSpartan
Impulse buy is your worst enemy, trust me.
EDIT : Also, I didn't know there was 7,2 V batteries for airsoft haha!
AEP batteries are 500mah 7.2v. Those would be to weak to ever power a standard mechbox though. There are also 7.4v lipo batteries that exist and provided sufficient power as well.
Long story short, if your interested in digging up info on echo all you really need to do is google reviews for JG brand guns, as Echos are simply nothing more than JG rebrands.