Let's Make Robots!

Battery suggestion.

i am using this 4 dc motor(100rpm) and 2 l293d motor drivers..if i want to run it for 15 minute.what is the best option for me?i dont want the robot to get too much heavy....
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http://letsmakerobots.com/node/28427#comment-72880

Here's an excellent write up (by myself of course) about batteries.