There are literally countless places on the internet that you can buy battery chargers from. The company though with the best review is www.harborfreight.com/chargers.

To learn more about battery technology you can go to Battery Tech, Alternative Energy Source, Science Daily, Extreme Tech, Popular Mechanics and Technology Review.

The length of battery life depends on camera setup. using flash, longer turn off times and using the led review feature cuts battery time down considerably.

bgr.com has an excellent review for the Motorola droid x. from hardware display to software to battery to conclusion. easy to understand with perfect pictures to coincide with the information. also has a list of related posts and user comments to refer to.