I would think you are ok down to about 9.8 volts or so. I have ran my CRX down to 9 volts but not on purpose. It worked ok but it is not a practice I like to do. I left my radio on by accident and no time to charge so I ran it. I finished at 8.9 volts and had on little hit. I don't like min ebeing under 10v to be safe.
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