This is G&G have told me that the gun has to have 11.1v as anything else is not powerful enough
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Thanks for your mail.
The most recommended Li-po battery is 11.1V with three piece or any other 11.1V Li-po which could be put inside this model.
We have received some feedbacks regarding no fire while pulling the trigger with 9.6V Ni-Mh or 7.4V Li-po battery as we recommended on manual.
Then we found it needs much power to run the motor pushing ETU system, even 9.6V Ni-Mh battery works, it will be out of power soon.
Therefore, we have revised the note on our manual and recommend 11.1V Li-po battery on our ETU models."
So i need to make a 11.1v fit :/