Smartphone battery life

I remember having a t68i that lasted a lot longer than a day on a charge. In fact when it got down to a day, I replaced the battery as I thought it was useless to walk around without being able to be away from a charger for more than 12-14 hours.

Now with my smartphone I’m stuck with something.. less than appealing with regards to battery life. Yes, the new iPhone 7 galaxy 5 s2 iOS android microsoft samsung vizio device of the future will have an amazing size difference. However, I would settle for a heavier, thicker phone if the charge lasted for a week. Or even 2 days.