During our vex robotics project work, we used some 9v rechargeable batteries to power the Vex Pic.  Your task for this week is to investigate an alternative 9v power source.  Search on the internet and come up with a website that contains an alternative power source with the cost for the individual parts or the whole component. Email me the downloaded cost sheet or the internet page link with an explanation for why you think that your choice is a suitable replacement.