A method for estimating a state of charge of a valve regulated lead-acid battery includes; an overcharge amount identification step of identifying an overcharge amount when the lead-acid battery is overcharged after an arbitrary reference time; an open circuit voltage acquisition step of acquiring an open circuit voltage of the lead-acid battery after the reference time; and a state-of-charge estimation step of estimating a state of charge of the lead-acid battery based on the acquired open circuit voltage and a correlation between an open circuit voltage and state of charge in which a rate of change of the state of charge with respect to the open circuit voltage is smaller as the overcharge amount from the reference time until an acquisition time of the open circuit voltage is larger.

Methods and systems for activating electric vehicles are provided. One method includes, in response to a first command to activate the vehicle, transitioning the vehicle from an inactive state to a wake state where a controller of the vehicle is activated and the vehicle is prevented from being propelled by an electric motor of the vehicle. The method also includes, in response to receiving a second command to activate the vehicle after receiving the first command, transitioning the vehicle from the wake state to a ready state where the vehicle is permitted to be propelled by the electric motor.

A system for facilitating operative connection between a charging station and a rechargeable power supply on an operating unit that is propelled by a drive, powered by the power supply, as to move over a subjacent surface. At least one connector is provided on the charging station and the operating unit. The connectors are configured to cooperate and establish an operative connection between the charging station and the operating unit. The operating unit is movable from a position spaced from the charging station into a charging position whereupon the connectors assume an engaged relationship. One of the charging station and the operating unit has a flat blade and the other of the charging station and operating unit has an elongate slot. The flat blade is movable guidingly within the elongate slot as the operating unit moves into the charging position.

The user can readily determine a battery station where a battery exchange can be performed without fail. A management server searches a battery station that suits a battery configuration of an electric vehicle operated by each user according to management information on the battery configuration thereof, and to transmit a guidance screen for guiding the user to the searched battery station to the terminal device carried by the user. In particular, the user is guided to a station where the number of fully charged battery devices in a battery exchanger is equal to or greater than the number of battery devices used by the electric vehicle.

An outdoor moving device includes a main body, a first energy storage device, a second energy storage device, and a connection assembly. The first energy storage device is capable of supplying power to the outdoor moving device and includes at least one first energy storage unit. The second energy storage device is capable of supplying power to the outdoor moving device and includes at least one second energy storage unit. The connection assembly is used for mounting the second energy storage device to the main body. The first energy storage device is detachably mounted to the main body, the first energy storage device is detachable from the main body to supply power to another power tool, the first energy storage unit includes a first positive electrode made of a first material, and the second energy storage unit includes a second positive electrode made of a second material.

An electric ATV having a frame and at least one battery mounted on the frame. 4 hub motors connected to the frame, and a wheel is connected to each of the hub motors. Each of the hub motors includes an independent controller, and the hub motors and associated ones of the controllers each being configured to independently provide both forward and reverse power and torque to the respective wheels to propel the ATV. Each of the hub motors can be mechanically attached to the frame using a quick-release connector and an electrical plug connection, to allow easier service or swapping out in the field. A genset can be provided in place of a battery, and multiple independent controls may also be provided for each motor/controller. An electric ATV with frame mounted motors/independent controllers for each wheel is also provided.

A battery with a battery management system is capable of charging the battery with recaptured energy from an energy regeneration device. The battery management system charges the battery with the energy regeneration device if the output voltage from the energy regeneration device is larger than the charging voltage of the battery.

A foldable electric scooter and a manufacture method of the same. The foldable electric scooter includes a main body assembly, a front fork assembly located at the front end of the main body assembly, a rear fork assembly located at the rear end of the main body assembly, a telescoping plate assembly located on top of the front fork assembly and a handlebar assembly located on top of the telescoping plate assembly. The foldable electric scooter has a double headset design that increases a rake angle for more steering stability while still keeping the steering upright for an upright holding of the handlebars. The foldable electric scooter is manufactured by stamping of flat plate material.

A battery-powered eclectic lawn mower includes battery packs mounted on a docking stations of a bus bar by way of a gravity-biased engagement. The lawn mower also includes a priority charging control logic for giving priority of charge to battery packs that have a state of charge over a threshold. The lawn mower also includes a live to drive system which alerts the user when the lawn mower is capable of moving in response to manipulation of controls. The lawn mower also includes a variable speed control which adjusts a sensitivity of speed controls such that more precise, slower speed control of the lawn mower is achieved when mowing around trees and the like.

Methods and systems for activating electric vehicles are provided. One method includes, in response to a first command to activate the vehicle, transitioning the vehicle from an inactive state to a wake state where a controller of the vehicle is activated and the vehicle is prevented from being propelled by an electric motor of the vehicle. The method also includes, in response to receiving a second command to activate the vehicle after receiving the first command, transitioning the vehicle from the wake state to a ready state where the vehicle is permitted to be propelled by the electric motor.