I have at present 2 X 80 Ah gel batteries controlled via an Imanager system which basically monitors each battery and charges when required.My question is this.If I add a 110ah lead acid battery controlled via a selector switch will it make that much difference to the controls.I only intend to have the 3rd battery as an emergency if my 2 others are down to about 50%.My plan is to then isolate one of the batteries via a battery changeover switch,so one of the originals will be disconnected and the 110 will take its place.I can change the parameters on the Iswitch to suit if needed.Dies this seem feasable before I shell out on battery box enclosure and selector switch please?Many thanks to anybody who has got this far!