Hi, I know this is an old thread but here is some info if you haven't already found it: The Sony part number for the battery is NP-1. It seems it was made just for the APR-2003 so good luck finding one. Its just a 12volt, 2 amp/hour so you could run this machine off any 12 volt battery with that rating using the power supply jack and a female 4 pin XLR Canon connector. You could even make a cig lighter adapter to use this off your car battery. Pin out: Pin 1 - Ground Pin 2 and 3 - no connection Pin 4 - + 12 volts Hope that helps some.. Dave

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