A battery system for a head-mounted display is provided. A first arm member has one or more interior walls defining a first chamber, wherein one or more first batteries are positioned in the first chamber of the first arm member. A second arm member has one or more interior walls defining a second chamber, wherein one or more second batteries are positioned in the second chamber of the second arm member. A base member is coupled to the first arm member and the second arm member. The base member has a base member power connector positioned along an exterior surface. A first auxiliary battery removably couples to the exterior surface of the base member via a first fastener, the first auxiliary battery having a first side and a second side. A first auxiliary battery power connector is positioned on the first side and aligns with the base member power connector.

Systems and methods for a flexible, head-mounted display is provided. The head-mounted display system may comprise a base member and one or more arm members that are coupled to the base member. Each of the arm members are coupled to the base member via a hinge that allows the arm members to move with respect to one another. Interior walls of the arm members and base member may define one or more chambers. One or more first batteries are positioned within a chamber in the first arm member and one or more second batteries are positioned within a chamber in the second arm member. One or more wired connections coupled to the batteries extend through the arm member(s) and hinges, and into one or more chambers in the base member, where the one or more wired connections are coupled to a battery monitor.

A portable battery pack containing multiple battery stacks operable to deliver power to equipment with differing power requirements that may further be compact and easily maintained. Further, the battery pack may have an integrated battery management system and charger system to prevent over-discharge and/or overcharging of the battery cells contained therein.

A portable battery pack containing multiple battery stacks operable to deliver power to equipment with differing power requirements that may further be compact and easily maintained. Further, the battery pack may have an integrated battery management system and charger system to prevent over-discharge and/or overcharging of the battery cells contained therein.

A portable battery pack containing multiple battery stacks operable to deliver power to equipment with differing power requirements that may further be compact and easily maintained. Further, the battery pack may have an integrated battery management system and charger system to prevent over-discharge and/or overcharging of the battery cells contained therein.

A battery system a plurality of battery strings, a charge equalization circuit, a relay matrix, and a balance controller. The plurality of battery strings comprises at least three batteries connected in series, where the battery strings are connected in parallel. The charge equalization circuit is capable of transferring charge between a pair of series connected batteries. The relay matrix is operatively connected between the charge equalization circuit and the plurality of battery strings. The balance controller operates the relay matrix based on at least one of a voltage and a current of any one of the batteries such that the charge equalization circuit is connected across any one of the pairs of series connected batteries in any one of the plurality of battery strings such that the charge equalization circuit transfers charge between the batteries in the pair of series connected batteries to which the charge equalization circuit is connected.

A storage system provides electrical power for driving a vehicle. The storage system has a first and a second storage module for storing electrical energy. The storage system includes a switching unit which is configured for connecting the first storage module and the second storage module in series for a charging operation and in parallel for driving the vehicle. The storage system includes a control unit which is configured to implement measures in order to reduce a difference between a state of charge of the first storage module and a state of charge of the second storage module in preparation for a parallel connection of the first storage module to the second storage module.

A charge-discharge control circuit includes a first cell balancing circuit having a first switch; a second cell balancing circuit having a second switch; a first cell balance detection circuit having a third switch; a second cell balance detection circuit having a fourth switch; and a control circuit which outputs a control signal to turn on the first switch in a prescribed cycle according to the voltage of a first battery which is higher than or equal to a cell balance detection voltage, or outputs a control signal to turn on the second switch in the prescribed cycle according to the voltage of a second battery which is higher than or equal to the cell balance detection voltage, and outputs a control signal to turn off the third switch and the fourth switch in the prescribed cycle during output of the control signal.

A battery management apparatus according to the present disclosure may include a sensing unit detachably mounted to a battery system and configured to measure a voltage of a cell assembly included in a battery pack, which is electrically connected to another battery pack in parallel, when being mounted to the battery system; a balancing circuit having a balancing resistor connected to a charging and discharging path of the cell assembly in parallel and a balancing switch for electrically connecting or disconnecting the cell assembly and the balancing resistor; and a processor operably coupled to the sensing unit and the balancing circuit.

This control apparatus includes (A) a first connecting part, which is connected with a driving control apparatus for controlling driving of a power unit for assisting a human power or with the power unit, and through which a current relating to charging and discharging of an electrical power storage device flows, (B) a second connecting part, which is provided separately from the first connecting part, and through which a current relating to charging to the electrical power storage device flows via an electrical connection, and (C) a controller to control charging and discharging of the electrical power storage device, which are performed by using a current, which flows in the first connecting part and/or the second connecting part.