capacity is always a good thing thats does provide safety, sort of, but there is no safety in a 5 cell pack If you lose a cell you may be down to 4.8V for a short time but the pack loses capacity fast thanks to the resistance of the dead cell. How would youknow you'velost a cell in flight? By the time you know you have a problem its too late and the blac bag shoudl be prepared.

If you feel there is safety in 5 cell packs then that is your choice. But please do not preach it as a safety fact, its simply not true. We all need a crutch to believe in from time to time.

True safety comes from redundancy, that is a fact.