I have installed a battery charger plug to keep the 12V Batt always at a good level. The "keep alive power" for the internal back-up battery of the Dynon EFIS DEK 180 is only charged, if the plug is connected. This to prevent taking current from aircraft battery while stored (to avoid low battery voltage).
Batt, keep alive plug
Plug with internal bridge from +12V to "keep alive pwr Dynon
