Abstract: A battery protection charging method and a charging system thereof are provided. The battery protection charging method includes obtaining an operation parameter of a battery. When a first protection condition is satisfied, a charging voltage of the battery is reduced to a first voltage. When a second protection condition is satisfied, the charging voltage of the battery is reduced to a second voltage. The second voltage is lower than the first voltage. The first (second) protection condition includes the cycle-life count is higher than a first (second) cycle-life threshold, the high voltage cumulative time is higher than a first (second) high voltage time threshold, and the high voltage-temperature cumulative time is higher than a first (second) high voltage-temperature time threshold.

Abstract: A backlight module includes a light guide plate, a light source, a first prism sheet, and a second prism sheet. The light source is disposed on a light incident surface of the light guide plate. The first prism sheet is disposed on a side of a light exiting surface of the light guide plate and has multiple first prism structures facing the light guide plate. The second prism sheet has multiple second prism structures facing the light guide plate. An included angle between an extending direction of the first prism structures and an extending direction of the second prism structures is greater than or equal to 85 degrees and less than or equal to 95 degrees. An included angle between the extending direction of the second prism structures and the light incident surface is greater than or equal to 85 degrees and less than or equal to 95 degrees.

Abstract: A battery management device includes a detection circuit, a charge control circuit, and a discharge control circuit. The detection circuit is configured to output a first control signal and a second control signal according to a volume of a rechargeable battery. The charge control circuit is electrically coupled to the rechargeable battery and the detection circuit, and configured to open a charge loop of the rechargeable battery according to the first control signal. The discharge control circuit is electrically coupled to the rechargeable battery and the detection circuit, and configured to close a discharge path of the rechargeable battery according to the second control signal.

Abstract: A battery protection charging method and a charging system thereof are provided. The battery protection charging method includes obtaining an operation parameter of a battery. When a first protection condition is satisfied, a charging voltage of the battery is reduced to a first voltage. When a second protection condition is satisfied, the charging voltage of the battery is reduced to a second voltage. The second voltage is lower than the first voltage.

Abstract: A battery management device includes a detection circuit, a charge control circuit, and a discharge control circuit. The detection circuit is configured to output a first control signal and a second control signal according to a volume of a rechargeable battery. The charge control circuit is electrically coupled to the rechargeable battery and the detection circuit, and configured to open a charge loop of the rechargeable battery according to the first control signal. The discharge control circuit is electrically coupled to the rechargeable battery and the detection circuit, and configured to close a discharge path of the rechargeable battery according to the second control signal.

Abstract: A ball includes a core, and two 8-shaped leather cover pieces secured onto an outer peripheral portion of the core with such as the adhesive materials. A water-proof outer layer is formed on the outer peripheral portion of the core for protecting the core and for preventing the core from being wetted, the 8-shaped cover pieces are secured onto the outer layer. The outer layer includes an 8-shaped seam for forming two 8-shaped recesses and for receiving the cover pieces. The seam has a number of bulges for simulating the raised seam or stitches of the typical balls.

Abstract: A ball includes a core, and two 8-shaped leather cover pieces secured onto an outer peripheral portion of the core with such as the adhesive materials. A water-proof outer layer is formed on the outer peripheral portion of the core for protecting the core and for preventing the core from being wetted, the 8-shaped cover pieces are secured onto the outer layer. The outer layer includes an 8-shaped seam for forming two 8-shaped recesses and for receiving the cover pieces. The seam has a number of bulges for simulating the raised seam or stitches of the typical balls.

Abstract: A base ball includes a central spherical core made of high density cork, a plurality of highly elastic rubber layers wound upon said core, a first layer of blended wool yarns with different diameters wound upon said rubber layers, a second layer of blended wool yarns with different diameters wound upon said first layer, a moisture proof layer of soft foam wound upon said second layer, a layer of yarns wound upon said moisture proof layer and then sprayed with adhesive agent, and an outer cover encasing said layer of yarns, whereby the moisture proof layer of soft foam can effectively prevent the base ball from getting moisture and can provide stable resiliency thereby enabling the base ball to keep its weight and resiliency at a stable condition and therefore warranting fair play even in bad weather.

Abstract: A baseball or a softball includes two or more cover members engaged on the outer portion of a core and having an abutting peripheral portion. A pad is engaged between the core and the abutting peripheral portion of the two cover members and is stitched and secured to the abutting peripheral portion of the cover members by a thread. When the thread is tightened, a number of bulges may be formed along the abutting peripheral portion of the cover members. The thread may be engaged between and protected by the bulges from being easily worn out.

Abstract: A baseball includes a spherical core of foamable material and three layers of foamable material engaged on the spherical core and a cover layer engaged on the three layers. The intermediate layer of the three layers includes a hardness and a density greater than that of the other two layers and less than that of the spherical core, for allowing the other two layers to form a cushioning device and for preventing the players from being hurt by the baseball.