Personally, I've been running all my stuff over 6 volts for years without a problem but I try not to go overboard with it. Yes, I use regulators (fromeco) but I also "over" battery. I'm never seeking the lightest possible weight for my own stuff because I just don't have the ability to see the difference in 4 or 8 ounces of flying weight. I know people that use unregulated 7.4 volt lipolys and most of the time they get away with it, but not always. From 6 to 7 volts there is very little chance of having a problem unless something else is wrong as well. As Tom pointed out so well.