The battery that comes with the gun is crap. I knew it was bad as soon as I heard the rate of fire from a fully charged battery. It was laughable.
If you read the description of the gun is says this
(Free testing low amp. low power battery & wall charger included with each rifle, but we highly recommend using a good Matrix & compatible 8.4V or 9.6V, or Lipoly battery to power this high end AEG rifle due to the integrated high power gearbox.)
Get yourself a new Intellect or Tenergy 9.6v stick battery and you'll be fine.
Amazon.com: Intellect Rechargeable Airsoft Battery: Small Plug/Stick Configuration (1400mAh, 9.6V, 2/3A Cells): Sports & Outdoors
If you read the description of the gun is says this
(Free testing low amp. low power battery & wall charger included with each rifle, but we highly recommend using a good Matrix & compatible 8.4V or 9.6V, or Lipoly battery to power this high end AEG rifle due to the integrated high power gearbox.)
Get yourself a new Intellect or Tenergy 9.6v stick battery and you'll be fine.
Amazon.com: Intellect Rechargeable Airsoft Battery: Small Plug/Stick Configuration (1400mAh, 9.6V, 2/3A Cells): Sports & Outdoors