few equipments are always connected to the battery bus bar whatever the battery push button switch status . this causes a continous current drain of about 150 mA on battery 1 and 250 mA on battery 2 when the battery p/b switch is in the off position. talking into account a battery capacity of 75persent of nominal capacity, I.E. 23 AH , thebattery will be discharged after approximately 2 days