I'm old-school, I can't help it.
I have been doing it for years, and my theory is that it won't harm the battery. After the 3 cycles I charge whenever the battery gets to 50%.
This is from Phandroid:
There is a popular debate as to whether or not Li-ion batteries need to be “conditioned” or “primed.” The process goes like this:
Power on your new device out of the box.
Use normally until the battery completes one cycle, reaching 0 percent capacity.
Recharge the battery to 100 percent.
The idea is that the battery is initially calibrated by allowing it to complete one full power cycle without charging after your smartphone is powered on for the first time. Some even suggest to repeat this cycling process up to three times for a new device. This process is said to reset the battery’s memory.
http://phandroid.com/2014/05/09/galaxy-s5-extended-battery/