Unfortunately, the Evo 4g required that I have mutltiple charges all over the place. At home, in my car, at work, and just about anywhere I thought I might be because that phone was a battery hog.
I have since sold my Evo, with many of the chargers going along with the device, but I kept my car charger and work charger and use them both with my SGSIISE4GT.
This device has excellent battery life so I don't need to recharge as often, but there is no need to purchase additional chargers if you already have one around.