System and method for preserving back-up battery for improved back-up availability

A battery management circuit, comprising:

• a load electrically connected to a main battery and a backup battery through at least one switch, wherein said at least one switch comprises a main switch and a back-up switch, wherein said main switch is associated with said main battery and said back-up switch is associated with said back-up battery;
• and
• a low leakage voltage monitoring circuit is electrically connected to said main battery, said backup battery, and said load, wherein said low leakage voltage monitoring circuit monitors a voltage from said main battery and triggers a changeover to said backup battery based on a threshold and wherein a main battery interface path within said circuit is facilitated by a bypass diode for automatically switching said circuit to avoid power interruptions.