A system for determining an operating mode of a battery includes a voltage sensor configured to detect a present voltage across terminals of the battery. The system further includes a non-transitory memory configured to store previously detected voltages across the terminals of the battery, and a previous operating mode of the battery. The system further includes a processor coupled to the voltage sensor and the non-transitory memory and configured to determine the operating mode of the battery by comparing the present voltage across the terminals of the battery to the previously detected voltages of the battery and based on the previous operating mode of the battery.

A method of determining a reserve time of a monobloc includes detecting, by a voltage sensor, an end of discharge voltage of the monobloc after a deep discharge of the monobloc. The method further includes receiving, by a processor, the end of discharge voltage of the monobloc. The method further includes determining or receiving, by the processor, a duration of the deep discharge. The method further includes calculating, by the processor, a discharge reserve time of the monobloc based on the end of discharge voltage and the duration of the deep discharge.

The system may be configured to perform operations including measuring a temperature and a voltage of a battery at various times producing data points, wherein each data point comprises the temperature and voltage of the battery and a respective time that the temperature and voltage was measured; assigning each data point to a respective cell in a matrix stored on a, wherein the matrix comprises a first axis comprising voltage ranges and a second axis comprising temperature ranges, wherein each cell is associated with a voltage range and a temperature range, wherein the voltage and temperature of each data point is within the voltage range and temperature range, respectively, of the respective cell; and/or generating a first value in a counter comprised in each cell reflecting a total number of data points assigned to the cell, such that the first value in each cell is stored in the memory.

A method is disclosed for determining a state of charge, a self-discharge rate, and a predicted amount of time remaining (tREMX) until the battery will self-discharge to a pre-determined minimum state-of-charge (SOCmin) under storage or transit conditions, in a disconnected battery. The method further discloses calculating a time to recharge the battery (ReChargeTime) from its current SOC to a desired SOC. A battery monitor circuit, embedded or attached to a battery, monitors an instantaneous internal temperature (Tx) and a voltage (Vx) of a disconnected battery to perform the analysis and provide notification, scheduling, and take other actions. In an example embodiment, the method further comprises displaying this determined battery information on the remote device without any physical connection between the remote device and the battery.

A method for determining a remaining life of a battery includes detecting, by a voltage sensor, multiple voltages of the battery. The method further includes detecting, by a temperature sensor, multiple temperatures corresponding to the battery. The method further includes receiving, by a processor, the multiple voltages and the multiple temperatures of the battery. The method further includes determining, by the processor, an amount of float life consumed during a float mode of the battery based on at least one of the multiple temperatures. The method further includes determining, by the processor, an amount of cycle life consumed during a discharge mode of the battery based on at least one of the multiple voltages. The method further includes calculating, by the processor, the remaining life of the battery based on at least one of the amount of float life consumed or the amount of cycle life consumed.

A battery monitor circuit, systems and methods are disclosed. The battery monitor circuit may comprise a voltage sensor, a temperature sensor, a processor for receiving a monitored voltage signal from the voltage sensor, for receiving a monitored temperature signal from the temperature sensor, and for generating voltage data and temperature data based on the monitored voltage signal and the monitored temperature signal, an antenna, and a transmitter. The battery monitor circuit may be configured for wirelessly communicating the voltage data and the temperature data to a remote device, via the antenna. In an exemplary embodiment, the battery monitor circuit is configured to be located external to the battery and wired electrically to the battery.

A battery monitor circuit, systems and methods are disclosed. The battery monitor circuit may comprise a voltage sensor, a temperature sensor, a processor for receiving a monitored voltage signal from the voltage sensor, for receiving a monitored temperature signal from the temperature sensor, and for generating voltage data and temperature data based on the monitored voltage signal and the monitored temperature signal, an antenna, and a transmitter. The battery monitor circuit may be configured for wirelessly communicating the voltage data and the temperature data to a remote device, via the antenna. In an exemplary embodiment, the battery monitor circuit is located internal to the battery and wired electrically to the battery.

The system may be configured to perform operations including receiving battery information, such as voltage data, temperature data, battery-specific data, and/or application-specific data; and displaying at least a portion of such data on a graphical user interface on a display screen. The operations may further include analyzing at least a portion of the battery information to monitor or determine battery health and performance, and displaying the results of such analysis on the display screen.

Described herein are methods for determining, based on actual crank conditions, an ability of a battery connected to an electric starter motor, to start an internal combustion engine, wherein the battery is a single monobloc or a plurality of monoblocs that are electrically connected in series or parallel. The method may comprise: receiving battery temperature data, representing a temperature of the battery at a time of cranking the internal combustion engine; receiving voltage data monitored from the battery, determining an instantaneous minimum voltage of the battery during the time of cranking the internal combustion engine; and determining a capability of the battery to crank the internal combustion engine based on the battery temperature data and the instantaneous minimum voltage of the battery.

A method for estimating a SOC of a battery electrically coupled to at least one of a load or a power source includes detecting, by a voltage sensor, voltages of the battery. The method further includes determining, by a processor, an average voltage of the battery by averaging the detected voltages of the battery over a predetermined period of time. The method further includes determining, by the processor, a present operating state of the battery based on at least one of the detected voltages of the battery. The method further includes determining, by the processor, a present SOC of the battery based on the present operating state of the battery and the average voltage of the battery. The method further includes transmitting, by the processor, the present SOC of the battery to an output device for outputting the present SOC of the battery.