I think that is preferable to keeping it permanently plugged in to the mains (if generally used static) with your battery connected or fully charging it every night prior to the next day regardless of the amount of charge left.
I don't believe there is a right or wrong way as it entirely depends on your use of the laptop.
I have an Acer netbook that is on standby most of the time, with short periods of use per day. That I generally do what you are doing, but I don't let it get that low, I normally charge it around 20%.