I had same plane as you and it balanced a little nose heavy with battery and receiver mounted in supplied foam block at the front of the radio compartment, just behind teh fuel tank. Battery in front of the receiver...
I had a Supertigre GS 40 engine up front and it needed no nose weight. IF you have to, slide the receiver battery under the fuel tank, but try not to add weight if you can avoid it. That's a great flying airplane, mine was nose heavy but not much, but considering it was my first low wing plane that's how I wanted it.


Andy