Should I completely use my battery before charging?

I just bought a MBP with retina...15 max'd out. Should i kill my battery (is it healthy?) every time before recharging it? does it matter if i only charge it to 70% every time? Should i leave it plugged into the AC whenever i can?
~Thanks

No. Constant discharging and charging is injurious to the health of the battery.
Use it on battery whenever needs to be.
Keep the computer plugged in whenever possible.
If you keep the computer always plugged in, make sure that twice a month
run it on battery until battery level drops to about 50-40%.
More about batteries:
http://www.apple.com/batteries/notebooks.html
http://support.apple.com/kb/HT1446

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