I "cycle" my batteries after each outing,to check for cells going bad or reduced capacity.I keep my batteries on continuous "Trickle" charge,So they ARE fully charged at all times.I have dual batteries,and dual switches in ALL of my planes.And my batteries are all 1800 mah capacity.I could fly my 4lbs plane for a full 8-10 hours without having to worry about remaining battery capacity.
I don't feel I have the need to check my batteries before each flight.I don't feel I need to check the batteries before the 3rd or 4th flight(I have done my checks before coming to the field).
I feel anyone who "Needs" to check his batteries before every flight is using "Unsafe" equipment.I would VOTE to BAN them from the club.But, I won't!