Squeeze the Most Juice Out of Your iPhone or iPad Battery – Wired How-To Wiki.

The main thing you can do to extend your battery’s life is to follow one simple rule of thumb: ABC, or “Always Be Charging”. The battery’s typical Depth of Discharge, or DOD, is directly related to how many cycles it will take before its capacity drops to 80%. The more you have to charge your battery before it’s full, the less full charge cycles you’ll get out of it. The logic of this so simple, I’m a little ashamed that I didn’t figure it out sooner.

Apparently I’ve been doing it wrong for the past five years.. The logic of this so simple, I’m a little ashamed that I didn’t figure it out sooner.