An external battery, includes a battery cell, a charging unit configured to generate a charging current with an external power supplied from a charger to an input terminal thereof and to transfer the charging current to the battery, a detector configured to sense a voltage state of the input terminal and determine a current value of the charging current supplied to the battery cell, based on the voltage state, and a main controller unit (MCU) configured to control charging of the battery cell by the charging current, calculate an estimated full charging time for fully charging the battery cell, based on a current value of the charging current, and calculate a charging time while the charging current is flowing.

An intelligent rechargeable battery pack having a battery management system for monitoring and controlling the charging and discharging of the battery pack is described. The battery management system includes a memory for storing data related to the operation of the battery, and the battery management system is also configured to communicate the data related to the operation of the battery to other processors for analysis.

A vaporizer may include a vaporizer body configured to couple with a vaporizer cartridge including a vaporizable material. The vaporizer body may include a first power source configured to discharge a current to a heating element in order to cause a vaporization of at least a portion of the vaporizable material included in the vaporizer cartridge by at least increasing a temperature of the heating element. The vaporizer configured to engage in a reverse charging with a device in which the first power source of the vaporizer charges or is charged by a second power source at the device. Various embodiments of the vaporizer cartridge are provided.

A shopping cart system includes a shopping cart that includes an input connector that receives, from the power supply device or a previous stage cart, a charging current and a DC voltage of a DC power supply different from a supply power supply of the charging current, a first resistor connected in series to an input line of the DC voltage, and a first output connector that outputs the DC voltage via the first resistor and a part of the charging current received by the input connector. The power supply device includes a second output connector that outputs a charging current and a DC voltage via a second resistor connected in series to an output line of the DC power supply, and an energization control unit that stops the charging current when a current flowing through the second resistor falls below a predetermined value.

The invention discloses method and apparatus for quantitative analysis of battery performance and an electronic device. The method includes performing a full charging/discharging process on a to-be-analyzed battery cluster, and determining differential capacities versus voltage of a plurality of cells in the battery cluster at different times; determining first times and first states of charge (SOC) when the differential capacities versus voltage of the cells reach a first peak and second times and second SOCs when the differential capacities versus voltage of the cells reach a second peak, and determining capacity parameters of the cells; and performing quantitative analysis on the battery cluster according to the capacity parameters of the plurality of cells. Accordingly, the battery cluster does not need to be disassembled. The capacity parameters can be quickly and accurately determined through a full charging/discharging process. The method requires can realize relatively accurate quantitative analysis for the battery cluster.

A portable fan with predictable battery life and a method for predicting battery life thereof. The portable fan includes a fan body, where a circuit board assembly and a storage battery are installed in a shell of the fan body, a microprocessor and a current collector are encapsulated in the circuit board assembly, a load and a display device are provided on the fan body, and the display device includes a function lighting display area and a battery life display area. According to the portable fan, the display device can be used to indicate a working mode that the fan body is currently turned on and the working battery life that the storage battery can provide under the corresponding working mode. An intuitive and standard time unit is used for indication, so that a clear visual perception effect is achieved.

An apparatus includes of a first earbud and a second earbud, each including an interface chip and a case. The case includes a case interface chip configured to communicate data with, and transfer power to, interface chips of the first earbud and the second earbud. The case also includes a housing to provide enclosures for the first earbud and the second earbud. The case interface chip is mated with interface chips of the first earbud and the second earbud when the first earbud and the second earbud are inserted in the housing, and wherein the case, the first earbud, and the second earbud are configured to operate at a multiple, different bias voltage levels.

A method of estimating a charging time of a battery, includes: estimating an SOC of the battery by measuring at least one parameter of the battery; estimating an internal resistance of the battery based on the at least one parameter of the battery, the SOC of the battery, and SOC-OCV data; estimating a time length of a constant current (CC) charging section based on the SOC, the internal resistance, and the at least one parameter of the battery; and estimating a time length of a constant voltage (CV) charging section based on the SOC, the internal resistance, and the at least one parameter of the battery. The estimating of the time length of the CV charging section includes: estimating a charging current of the battery in a unit of an SOC step; and calculating the time length of the CV charging section in the unit of the SOC step.

A method of obtaining battery capacity, includes: acquiring a voltage-capacity curve of a battery; performing differentiation on the voltage-capacity curve to obtain a voltage differential-capacity curve; identifying wave crests in the voltage differential-capacity curve; calculating heights and widths between each wave crest and the adjacent wave trough on the left and the right; calculating a determination index p according to the heights and the widths; determining a voltage knee point in the voltage-capacity curve according to a wave crest with a minimum determination index; acquiring a reference capacity value corresponding to the voltage knee point in the voltage-capacity curve; after the battery reaches a full-charge state, acquiring charging electric energy of the battery for charging from the voltage knee point to the full-charge state; and obtaining a capacity of the battery based on a sum of the reference capacity value and the charging electric energy.

An electric vehicle (EV) charging system includes a controller comprising a central processing unit and implemented on a single printed circuit board, and a first output connection and a second output connection each coupled to the controller and operable to deliver power via the AC power supply. The controller is operable to direct the AC current from the higher voltage side of the printed circuit board to the first output connection comprising a first output head operable to charge an EV, detect a load on the second output connection, halt the AC current directed to the first output connection responsive to detecting the load on the second output connection, and direct the AC current from the higher voltage side of the printed circuit board to the second output connection after halting the AC current directed to the first output connection.