I need help building a DC UPS. Did I understand correctly the idea of using LTC 4412 to control fully isolated MOSFET switchs? I am suggesting to use an external switching power supply (Wall Adapter) and a backup 12V gel or LiFePo4 battery. For periodic recharging of the battery, I plan to use a separate charging module, which will connect if there is power from the Wall Adapter and if the battery voltage is below 11 volts. The charge module will be connected to the battery with a VT5 transistor. The entire circuit will be controlled by a separate microcontroller.