JetSD,
After my first 1/4 scale, I have been flying with 6 volt unregulated packs for 2 years. The 2001 TOC pilots all used unregulated 6 volts packs except for 3 of them. I have heard on some of the high end servos, a topped off charge may cause glitches. I have had this only on 1 HS-605 and it would stop long before I could get to the runway and take off. The extra power is worth the cost of the extra cell to me.