Argofet enables simultaneous charging of two batteries with one charger without connecting the batteries in parallel.
Discharge of the consumable battery does not affect the charge status of the starter battery. Unlike diode-based insulators,
Argofet's voltage drop is almost non-existent: with small currents < 0.02 V and with larger currents around 0.1 V. There is no need to increase the charging voltage, as long as care is taken that the cables are not unnecessarily long and/or thin.