powering arduino project

i need advice external power source arduino project. i'm controlling standard servo, microservo, , small gear motor. code runs standard servo few seconds, micro servo few seconds, , small gear motor 5 seconds. process reversed , code stops. i've been using energizer 9v battery , has worked past week. battery dead. better alternative 9v battery? i've tried 4 aa's , not enough power generated run device.

thanks,
jon

so happens when code stops?
significant amount power can conserved not using entire arduino, barebones chip.

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