I wonder why guys put themselves through all this worry about battery pack failures. In 35 years of flying R/C, everything from helicopters to turbine jets, I have never had any battery have a failure of any kind. Currently I use A123 packs in all of the turbine jets. They have been great.
As long as we don't use any battery that is suspect, like something peculiar going on with one or more cells, or no longer holding a charge like it once used to, you should be good to go.