Ok I have moved this question to a new thread , what about the different charging voltages for batteries the only way would be with a DC-DC for in vehicle charging, does it really matter . My Dmax shows 14.2 / 14.4V on the ScanGauge when driving . I still have the std starting battery under the bonnet of my Dmax and a 100a/h AGM Deep Cycle batt under the tray charging through a Redarc VRS it all seems to work ok . My question is about charging with my 240volt Ctek 5amp , 8 stage charger , I connect it to the Ute fairly regularly, why I dunno I just do , it seems like a good idea . The Ctek has 4 settings , motorcycle, car , agm and recondition and 8 stages , when I connect it to the AGM Batt I set it to AGM but if I connect it to the start batt what should I set it on because it will close the VRS and charge both Start and AGM batteries , is that ok ? It always goes to the 7th stage , I assume is float after a while . What about the recondition stage 8th stage , I have never set it to that , should I and how often , The instructions that came with the Ctek don't really say . My Tvan has a Calcium Battery about 75a/h I think , the battery was installed new by the previous owner when I bought the Tvan second hand , how should I charge it when the Tvan is parked up in the garage, All 3 are connected when towing , but I only have the one VRS under the Dmax bonnet.