Device and method for charging a battery discharged beyond at least one operating threshold

A device comprising:

• a battery charger circuit operably coupled to a battery;
• a deep discharge controller circuit operably coupled to the battery charger circuit, the deep discharge controller circuit operable to obtain a charging command, to activate a trickle current to a battery, to respond to a condition that a voltage of the battery does not satisfy a deep discharge threshold by entering a first charging state, and to respond to a condition that a voltage of the battery satisfies a deep discharge threshold by entering a second charging state;
• and
• a fuel gauge circuit operably coupled to the battery charger circuit, the battery, and the deep discharge controller circuit, the fuel gauge circuit operable to respond to a condition that the voltage of the battery does not satisfy a fuel gauge threshold by supplying the trickle current in a burst to the battery, and to respond to a condition that the voltage of the battery satisfies the fuel gauge threshold by supplying the trickle current continuously to the battery.

A system comprising:

• a battery charger operable to obtain charging power from a power source;
• a deep discharge controller operable to obtain a charging command, to activate a trickle current to a battery, to respond to a condition that a voltage of the battery does not satisfy a deep discharge threshold by entering a first charging state, and to respond to a condition that a voltage of the battery satisfies a deep discharge threshold by entering a second charging state;
• and
• a fuel gauge circuit operable to respond to a condition that the voltage of the battery does not satisfy a fuel gauge threshold by supplying the trickle current in a burst to the battery, and to respond to a condition that the voltage of the battery satisfies the fuel gauge threshold by supplying the trickle current continuously to the battery.