Provided are a battery pack and an electrical apparatus by which information can be transmitted at an appropriate timing from the battery pack to a device body. A battery pack (10) includes: a serial communication reception circuit (31) and a temperature information transmission circuit (32); an LS terminal that is selectively connected to the serial communication reception circuit (31) or the temperature information transmission circuit (32); a first switching circuit (21) that is provided between the LS terminal and the serial communication reception circuit (31) and the temperature information transmission circuit (32); and a V terminal that is connected to the first switching circuit (21). The first switching circuit (21) switches between connecting the serial communication reception circuit (31) or the temperature information transmission circuit (32) to the LS terminal according to a signal inputted from the V terminal.

The utility model refers to an automobile start-up adapter, wherein it comprises a shell and a circuit board provided inside the shell. The shell is provided with an input terminal for electrically connecting with an output terminal of a lithium battery of a power tool and an output terminal for electrically connecting with a clamp. The input terminal and the output terminal are communicated through a circuit board, and a voltage identification circuit and a voltage conversion circuit are provided on the circuit board. The automobile start-up adapter of the utility model can use the lithium battery of the hand-held electric tool to supply power for the emergency start-up of the automobile.

A system includes a primary coil, a first drive circuit, a first sense circuit, and a communication and control circuit for providing power inductively to a portable device that includes a battery and an inductive receiver unit including a receiver coil and a receiver circuit. A portable device includes a battery and a receiver unit capable of receiving inductive power from a compatible inductive charging system including a base unit with a primary coil and associated circuit. A system includes a system rechargeable battery, an inductive coil, a drive circuit, a sense circuit, a communication and control circuit, a receiver rectifier circuit, and a wired power input for providing power inductively to a compatible portable device comprising a battery and an inductive receiver unit including a receiver coil and a receiver circuit.

A system for charging a small-capacity battery from a large-capacity battery. The large-capacity battery subsystem and the small-capacity battery subsystem cooperate with each other in different stages of a charging cycle of the small-capacity battery. The large-capacity battery subsystem includes a large-capacity battery, a large-capacity battery charging circuit and a constant-voltage and constant-current circuit which generates either a constant voltage or a constant current. The small-capacity battery subsystem includes a small-capacity battery and a linear charging circuit which uses the constant voltage or the constant current to charge the small-capacity battery. The charging cycle of the small-capacity battery includes a CC stage and a CV stage. In the CC stage, the linear charging circuit meets the ideal diode characteristics and outputs a constant current. In the CV stage, the linear charging circuit meets the linear charging characteristics and outputs a constant voltage.

Disclosed herein are battery-free charging systems for wireless headphones that have at least one proprietary electrical contact provided to charge an on-board power source of the wireless headphone. The battery-free charging system comprises a cable having a first end and a second end, a headphone socket coupled to the first end of the cable, a connector coupled to the second end of the cable, the connector for connecting the battery-free charging system to an external power source, and circuitry coupled to the headphone socket and to the connector. The headphone socket is configured to receive the wireless headphone, to couple the at least one proprietary electrical contact to the external power source, and to allow continued use of the wireless headphone while charging. The circuitry is configured to detect an orientation of the wireless headphone within the headphone socket and provide a charging signal appropriate for the detected orientation.

A vaporizer includes: a first input end and a second input end; a heating element arranged between the first input end and the second input end; and a level exchange module connecting the first input end and the second input end, so as to allow the vaporizer to be insertable into a battery rod rightly or reversely. One of the first input end or the second input end of the vaporizer forms a power supply voltage input end of the vaporizer, and an other end of the vaporizer forms a ground voltage input end of the vaporizer.

Provided is a battery charging system for charging an internal battery of a jump starter device, including a universal serial bus (USB) connector for receiving power from a direct-current (DC) port of a vehicle, a voltage detection circuit configured to detect a voltage of a vehicle battery, and a USB driver configured to control charging power from the USB connector to the internal battery of the jump starter device based at least in part on the detected voltage of the vehicle battery.

A control circuit for a battery device, which includes a first power management module, a control module, and a first enabling module. The first power management module receives a first enabling signal of a trigger element of the battery device and a first voltage output by a battery module, and converts the first voltage into a second voltage to supply power to the control module and the first enabling module. The control module is configured to control the first enabling module to output a second enabling signal to the first power management module. When the control module is abnormally reset, the first enabling module outputs the second enabling signal to the first power management module. Therefore, serious consequences such as sintering caused since a relay and other switching elements are directly disconnected without being discharged are prevented.

An apparatus for protecting a battery pack is configured to release reverse connection of the battery pack by detecting the reverse connection of the battery pack even in a case where the reverse connection of the battery pack is not detected through a battery pack controller.

A rechargeable battery jump starting device with a dual battery diode bridge system. The dual battery diode bridge, for example, is configured to protect against a back-charge to a first 12V battery and/or a second 12V battery after a vehicle has been jump charged to prevent damage thereto.