Extend Your Battery Life

When putting a cellphone, remote control, or other device into long-term storage Popular Mechanics advises:

Your best bet for long-term battery storage is to run the charge down to 50 percent, remove the battery from the device, and keep it cool. But even ideal storage conditions can leave you with a dead battery after three or four years. (H/T Glenn Reynolds)

On the other hand, keeping one's stomach half full at all times probably won't extend one's life. (I've tested that approach so that you won't have to.)