Battery capacity: There is no standard capacity, and it is determined based on the specific requirements of the appliances or equipment. Generally, the capacity is 2200ma/h, 5AH, 10Ah, etc. Some electric vehicles can have a capacity of 20AH or 50AH. The more batteries are connected in parallel, the larger the capacity. According to the physics formula, in a parallel circuit: Itotal=I1+I2+I3

　　Volume: The volume of a 12V lithium battery should be determined based on its capacity, and there is no unified specification. The larger the battery capacity, the larger the volume

　　Weight: Nowadays, many devices require lithium batteries with larger capacity and lighter weight, such as electric vehicles. Previously, lead-acid batteries were used, but now many electric vehicles have become lithium batteries due to their large capacity, light weight, and small size.

　　Charging and discharging current: The charging and discharging current of a lithium battery is determined based on the power of the device, and the electric power formula is P=UI. On the basis of a constant voltage, the greater the power of the device, the greater the required output current.

　　12V lithium battery applications: electric vehicles, power tools, laptops, mobile DVDs, UPS, GPS, medical equipment, etc

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