A backup battery system includes a charging-discharging module and a battery module. The charging-discharging module includes a first connector and a first engaging member. The battery module is detachably connected to the charging-discharging module and includes a second connector corresponding to the first connector and a second engaging member corresponding to the first engaging member. When the battery module is connected to the charging-discharging module, the first connector is joined with the second connector and the first engaging member is fixed to the second engaging member.

A backup battery system includes a charging-discharging module and a battery module. The charging-discharging module includes a first connector and a first engaging member. The battery module is detachably connected to the charging-discharging module and includes a second connector corresponding to the first connector and a second engaging member corresponding to the first engaging member. When the battery module is connected to the charging-discharging module, the first connector is joined with the second connector and the first engaging member is fixed to the second engaging member.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

A battery and an electronic device are provided. The battery includes a battery cell, including at least one anode of the battery cell and at least one cathode of the battery cell. The battery also includes a voltage detection circuit, wherein the voltage detection circuit detects a voltage of the battery cell. Further, the battery includes a protection circuit, wherein the protection circuit protects the battery cell based on the voltage of the battery cell detected by the voltage detection circuit.

A battery and an electronic device are provided. The battery includes a battery cell, including at least one anode of the battery cell and at least one cathode of the battery cell. The battery also includes a voltage detection circuit, wherein the voltage detection circuit detects a voltage of the battery cell. Further, the battery includes a protection circuit, wherein the protection circuit protects the battery cell based on the voltage of the battery cell detected by the voltage detection circuit.

There are provided an assembled battery and a battery pack having excellent cycle characteristics with respect to high rate charging and discharging. An assembled battery according to an embodiment includes at least one first single cell and at least one second single cell that are connected in series. The first single cell includes a positive electrode containing an active material represented by the general formula LiMO.sub.2 (M includes at least one element selected from the group consisting of Ni, Co, and Mn) and a negative electrode including a titanium-containing oxide. The second single cell includes a positive electrode containing an active material represented by the general formula LiM′PO.sub.4 (M′ includes at least one element selected from the group consisting of Fe, Mn, Co, and Ni) and a negative electrode including a titanium-containing oxide. The ratio of a charging resistance of the second single cell to a charging resistance of the first single cell is 1 or more and 1.5 or less if an open circuit voltage when the at least one first single cell and the at least one second single cell are connected in series is 4.5 V.

There are provided an assembled battery and a battery pack having excellent cycle characteristics with respect to high rate charging and discharging. An assembled battery according to an embodiment includes at least one first single cell and at least one second single cell that are connected in series. The first single cell includes a positive electrode containing an active material represented by the general formula LiMO.sub.2 (M includes at least one element selected from the group consisting of Ni, Co, and Mn) and a negative electrode including a titanium-containing oxide. The second single cell includes a positive electrode containing an active material represented by the general formula LiM′PO.sub.4 (M′ includes at least one element selected from the group consisting of Fe, Mn, Co, and Ni) and a negative electrode including a titanium-containing oxide. The ratio of a charging resistance of the second single cell to a charging resistance of the first single cell is 1 or more and 1.5 or less if an open circuit voltage when the at least one first single cell and the at least one second single cell are connected in series is 4.5 V.

A battery with at least two battery cells, which are connected by at least one electric connection element to one another, and a superordinate control device. Each of the battery cells is provided with at least one galvanic element, a battery cell housing for accommodating the galvanic element, at least one sensor device for detecting a physical and/or chemical feature of the battery cell, and a communication device for communicating with the superordinate device. The superordinate device is adapted to control an energy flow in at least one of the battery cells and/or from at least one of the battery cells as a function of the physical and/or chemical features of the battery cell. The invention further also relates to a motor vehicle with such a battery.

A method for charging a lithium ion secondary battery of the present invention includes a first step and a second step. In the first step, A, B, and C satisfy the relationship A>B and B<C, where A represents an average charging current value in the range where a charge rate of the lithium ion secondary battery is 0% or more and less than 40%, B represents an average charging current value in the range where the charge rate is 40% or more and 60% or less, and C represents an average charging current value in the range where the charge rate is more than 60%. In the first step, the ratio of C.sub.MAX to C.sub.MIN (C.sub.MAX/C.sub.MIN) is 1.01 to 3.00, where C.sub.MAX represents the maximum value of the charging current value and C.sub.MIN represents the minimum value of the charging current value.