Here is a system I have been using for years. It works great and you only use 1 battery. I run the glow to the plug full time. I have not replaced a glow plug in about 3 years. I can get 42 minutes of full time glow to a plug using a C size nicad 2000 mah and 35 minutes of full time glow using a 2000 mah AA nicad....

http://www.rcuniverse.com/forum/m_14...tm.htm#1941488


Ty