I think it may be a good idea to charge your phone at least twice a day, to extend the overall battery life. Also it may not be a bad idea, to purchase a back- up battery as a spare for your cell. They like Laptop batteries do not last forever. Another thing you could also do, is purchase a car charger.
Most people are on the road a good deal of the day like myself. So in between stops, you are consistently keeping your cell battery charged, at or near the full level, without having to worry about charging it when you arrive home. Hope these tips provide value in some way.