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A 12v battery should put out around 12.6v-12.8v with no load on it, so that 10.5v needs looking into. If you haven't already, check that the reading is correct with a multimeter. The mount's low voltage light starts flashing at around 11v, which would suggest that the reading is correct. Was the reading at the battery socket, or at the mount end of the cable? If at the 12v socket
I would take it back to the vendor.
raymo
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