AirsoftFix can modify the Tokyo Marui AEP to fit a 7.4v 1100mAh LiPo battery:
Check out this installation we did in December 2012 for a local Alaskan customer – his Marui NiCD batteries just weren’t cutting it at 10 degrees Fahrenheit, so we modified the gun to accept a BOL 7.4v, 1100mAh 15C Micro Stick LiPo with a Mini Deans-Type connector.
AirsoftFix can do this to your AEP for $79, including the battery and free return shipping to anywhere in the US! Contact us at 1-855-AIRSOFT or e-mail contact@airsoftfix.com to bring your AEP up to speed.
The parts used for this installation are available from AirsoftFix here:
BOL Red Small T-Type Connector