anti_hero

No contest Delta Force.

Hello, I am currently engaged in building a prototype. The main problem I am having is my battery running out of juice too quick. The main component is using a 5v brushless motor. I dont know much about batteries and I have been using a standard 9 volt in my rough prototypes. I need between 2 to 4 hours of run time to make it viable and so far I have been able to eek out 45 mins on a fully charged 9 volt. I have also been looking into rechargeable battery packs like the ones in cell phones and even the ones that are like 5 AA wrapped up and put out 6v. My question is what type of battery should I be using for battery life to get me as close as possible to my goal with out going bigger than say 5 AA's or two 9 volts. I realize that battery life alone will not get me to my goal and i am researching using a smaller and more energy efficient 5v brushless motor. Thanks! "anti-hero" FOB Liberty, Iraq