Hi LandyAndy, for a start, the charging voltage is just boarder line.
13.8 volts is the absolute minimum voltage level that the can be used to charge a battery.
Your right about the short driving trips. You need at least 5 minutes driving to replace the amps used to start the vehicle.
My first suggestion would be to get the battery load tested at an auto electricians. This test should be free so if they want to charge you for the test, go elsewhere.
I would also get them to test your voltage regulator and alternator. once warmed up and running at 1500 rpm, your vehicle should be turning out a minimum of 14 volts.
Cheers and let us know how you get on.



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