I have been running zippy and hobbico life 2cell batts for about 2 years "no regulators" using servos = hitec 5625 5645 635hb 5485hb hs81. futaba 148 5101 3001 3002 jr 507 517 d517 and probably a few more but thats all i could come up with off the top of my head..... just throwing this out there to see what if anything comes out in the wash. could it be the sustained higher voltage making it more suseptiable to binding then blowing ???