Well to drag up an old topic, the battery was connected to the charger most of the time over the winter and today I packed the charger away and put the battery back in the van it showed 13.1 volts after removing the charger.
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Then put the bed back together and tried the new topper.
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Put the bedding back in
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Car had a wash yesterday and a service today.
Been a cracking day here put the top up and left the van door open for a while 
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Soon be time for a trip 