Battery Strength/Power and Effect on Rang

Just wondering if anyone knows or has knowlege on this subject.

Is there anything that can help improve the range of your transmitter?  I'm thinking along the lines of mAh of the battery?  eg.  Would a battery that is 850mAh be less effective in providing a greater range than a 2300mAh battery?

there was a thread on this last month, can't remember who but there was talk about putting it to your chin or something and you would get a longer range. funny but said to be true by a member that had tested it. the body acts a an ant. fluids in your body being a better conductor.