arduino meno potente se alimentato da una batteria

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ciao tutti,
vi pongo subito il mio amletico dilemma, senza girarci troppo intorno... allora, io ho costruito con un mio amico una macchinetta che cambia direzione quando incontra un ostacolo, solo che se collego arduino al pc va che è una favola, se lo collego una batteria da 9v carica con un cavo (fatto da noi), va lentissima. può essere che serva più elettricità?
grazie tutti in anticipo,
lorenzo

batteria 9v tipo duracell (da telecomando)?


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