If a 4 cell RX pack reads over 4.8v, you don't need to charge unless you want to. If it reads 5.0v or higher, you probibly shouldn't fast charge it at all.
What is the absolute lowest you should let a 4.8v get before charging? I am very paroid. If mine gets to 4.9 or below I recharge. Am I being overly paranoid?
Wings