At 11.3 volts it is definitely 1 cell down. If you are going to use it keep it on a long lead away from your gear, 4-5 meters at least. The dud cell will sulfate when you put a load on the battery. If you've got some longish jumper leads use them to connect to reduce resistance back to the mount. Just run a couple of lighter gauge wires to the heater system for the last few meters. I've seen what fumes do to metal and it ain't pretty.
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