Battery charging cut-off circuit

A method for battery backup unit (BBU) cut-off and recharging, the method implemented on a microcontroller of a BBU cut-off and recharge circuit and comprising:

• detecting a loss of power from a main power supply, wherein power from a power entry connection connected to said main power supply flows to application circuits for an electronic device, and a mechanical relay switch with self-latch capability is positioned between a BBU and said power entry connection;
• opening said mechanical relay switch with said self-latch capability to enable said BBU to discharge through said power entry connection to said application circuits,
• detecting a status of charge (SOC) for said BBU, and
• upon detecting that said SOC is under a predefined threshold, setting said BBU cut-off and recharge circuit to a lockdown state by closing said mechanical relay switch with said self-latch capability.

A non-transitory tangible computer-interpretable medium encoded with instructions that, when executed by a microcontroller of a battery backup unit (BBU) cut-off and recharge circuit, cause the microcontroller to:

• detect a loss of power from a main power supply, wherein power from a power entry connection connected to said main power supply flows to application circuits for an electronic device, and a mechanical relay switch with self-latch capability is positioned between a BBU and said power entry connection;
• open said mechanical relay switch with said self-latch capability to enable said BBU to discharge through said power entry connection to said application circuits,
• detect a status of charge (SOC) for said BBU, and
• upon detecting that said SOC is under a predefined threshold, set said BBU cut-off and recharge circuit to a lockdown state by closing said mechanical relay switch with said self-latch capability.