To back up what the others are saying here, if you are running this thing stock and have an "import spring" in it, i.e. firing 430fps, then you will be drawing a lot of juice from that battery -- the stock G&P M120 motor that comes in the G&P MOE series is a weak motor and is generally not good at pulling anything stronger than M110 springs unless you supply it a lot of juice and slow gears.
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"Mah check"
Now you know
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