Provided is a technology capable of protecting a charge/discharge control circuit and a battery device from a reverse connection state without a separately provided protection circuit. The charge/discharge control circuit to be contained in a battery device including a secondary cell, an external positive terminal and an external negative terminal, and FETs which control charging and discharging of the secondary cell, respectively, includes: VDD and VSS terminals; a charge control terminal; a discharge control terminal; a voltage detection terminal to which a voltage applied to the external positive terminal is supplied; an NMOS transistor communicates the discharge control terminal and the voltage detection terminal; and a bipolar transistor having a collector to be connected to a drain of the NMOS transistor, an emitter to be connected to a source of the NMOS transistor, and a base to be connected to a bulk of the NMOS transistor and the VSS terminal.

A battery backup system comprises an input terminal configured to receive a source voltage from a power source, and an output terminal electrically coupled to the input terminal and a battery and configured to selectively communicate the source voltage to a load when the source voltage is available and to communicate a battery voltage to the load when the source voltage is unavailable. The battery backup system further comprises a power supply configured to convert the source voltage to a charging voltage and control circuitry electrically coupled to the power supply and the battery and configured to communicate the charging voltage to the battery to facilitate charging the battery when the source voltage is available. The control circuitry is configured to measure one or more parameters of the battery to evaluate battery health. When the battery polarity is reversed, battery terminals through which the battery is electrically coupled are shorted to one another, or the battery is removed, the control circuitry is configured to decouple the charging voltage from the battery.

A wearable earphone charger with automatic adjustment of positive and negative polarities includes a wearable bracket and two power supply seats disposed on the bracket. The bracket is provided with a power supply integrated control board and a power supply electrically connected to each other. Each of the two power supply seats is electrically connected to the power supply integrated control board, is provided with first and second power supply contacts that are used to supply power to an earphone, and is further provided with a detection contact. The power supply integrated control board is provided with a detection circuit used to detect whether the earphone is connected, and the detection circuit is electrically connected to the detection contact. The wearable earphone charger can realize automatic adjustment of positive and negative polarities of the wearable earphone charger, and thus is with high reliability and improved user experience.

A battery management device and a mobile terminal are disclosed. The battery management device includes: a charging unit; a battery unit including at least two batteries; a power supply management circuit; and an isolation unit configured to communicate one or more of the batteries with the power supply management circuit and block the backward flow of current between batteries. The charging unit, the battery unit, the isolation unit and the power supply management circuit are successively connected.

Vehicle power distribution circuit for connecting between a battery and a power line connected to a generator or DC/DC-Converter. The circuit has a charging line connecting the battery to the power line for charging the battery when a forward voltage is applied by the generator or DC/DC-Converter. An ideal diode arrangement is provided in the charging line for conducting a forward current from the generator or DC/DC-Converter to the battery when the forward voltage is applied. The ideal diode arrangement prevents conduction of a reverse current from the battery to the power line when a reverse voltage is applied.

A combined battery charger and engine jump start system configured to automatically determine in which operating mode to operate based on the output plug attached to an output outlet is disclosed. For instance, the system may include a single output outlet and a single cable capable of being attached to the single output outlet in multiple positions to enable the system to automatically operate in the correct mode. In another embodiment, the system may include a single output outlet and a cable for a battery charger process and a cable for an engine jump start process whereby a cable position or plug configuration enables the system to automatically operate in the correct mode. As such, the system is more cost effective to manufacture and more reliable in that the system is automatically places itself in the correct operating mode when a cable is attached thereto.

A power supply control device controls power supply by switching on or off a first semiconductor switch and a second semiconductor switch that are arranged on a current path. A first diode and a second diode are connected between a drain and a source of the first semiconductor switch and the second semiconductor switch, respectively. Cathodes of the first diode and the second diode are arranged downstream and upstream of the respective anode on the current path. If current flows through the current path even though a microcomputer has given an instruction to switch the first semiconductor switch and the second semiconductor switch off, a first drive circuit switches the first semiconductor switch on.

A battery management system of a battery apparatus includes a circuit to which a voltage from a power supply is supplied and configured to be used to manage the battery pack. A processor of the battery management system controls the circuit, measure a voltage supplied from the power supply, and corrects the measured voltage based on a voltage drop occurred in the circuit.

A jump starting device having USB. For example, a handheld jump starting device having USB for boosting or charging a depleted or discharged battery. The handheld jump starting device, for example, can include a rechargeable lithium ion battery pack and a microcontroller. The lithium ion battery can be coupled to a power output port of the device through a power switch circuit actuated by the microcontroller.

A discharge device for discharging a plurality of battery cells having an unknown state-of charge is disclosed. The discharge device includes a contact-connection element for the electrical contact-connection of respective battery cells in the plurality of battery cells, and a short-circuiting element. The contact-connection element includes, for each individual battery cell in the plurality of battery cells, an electrical contact having a non-return device. Each of the non-return devices is configured to prevent any return flow of electricity from the respective battery cells, via the contact-connection element, into a battery cell which is assigned to the respective non-return device such that electricity is removed in a unidirectional manner from the respective battery cell. Respective electrical contacts of the contact-connection element are electrically coupled in the direction of flow of electricity, down-circuit of the respective non-return devices. The short-circuiting element is configured to short-circuit the plurality of battery cells.