Ok folks, need to know the technical "yes or no" to adding an extra battery to the leisure system if it has adifferent AH rating . I dont mean a110 going with a 75, but say a 75 with an 85. Also could an automotive batt be coupled to a deep cycle leasure batt ? PS. The Tronix T4X charger from Aldi is superb and at only £9.99 a steal. Thanks in anticipation. Mitch.