Hi, we just bought an Lithium battery to replace our house Acid batt. We figure we cannot use our old Argo FET 100-2 to connect to our Lithium batt. We are told we should buy the Orion DC-DC. Does this mean that we no longer need the Argo FET 100-2?
Can we use only the Orion DC-DC between our Acid and our Lithium?