Running it all the way down is actually bad for it. Try to avoid your battery getting that low.
Running it down and charging it to 100% is not the best for the battery.
That's the new train of thought on batteries these days... You want to charge up to around 85% and keep above around 35%.
Me personally I'll charge up to around 90% and plug when is gets down to aboit 27%. I feel with moderate use i unplug in morning and get through the day no problem and into the evening. Not bad battey life considering.
No one has time for that crap.