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The charging control methods for lead-acid batteries and lithium-ion battery chargers are different. Due to the fact that lead-acid battery chargers are generally set in a two-stage or three-stage charging mode, the voltage levels of lithium-ion batteries and lead-acid batteries do not match. There are also many types of lithium-ion batteries, and the battery performance and battery protection board parameters may vary. Therefore, lithium-ion batteries are not like lead-acid batteries, which have universal battery chargers. Generally speaking, lithium-ion batteries come with a dedicated charger when they leave the factory. To protect lithium-ion batteries, a dedicated charger is required.

The charging control of lithium-ion batteries first charges according to a constant current, and then when the battery voltage rises to 4.2V, the voltage no longer rises. The charger detects the current, and if the current is less than a certain value, the charging ends. Lithium ion batteries are sensitive to overcharging, so the protection circuit is complex. The maximum charging rated voltage for a single nominal 3.6V battery is 4.2V, with an allowable upper limit of no more than 1%.

The ideal charging current for lead-acid batteries is pulse type. Pulse charging is best achieved through direct rectification and unfiltered pulsating DC charging using the 50-60HZ mains power supply we use. Due to the high self discharge rate of lead-acid batteries, constant voltage charging is generally used when using power frequency charging.

The lead-acid battery charger combines high-frequency switching power supply technology with embedded microcomputer control technology, using intelligent dynamic adjustment technology to optimize the charging characteristic curve and effectively extend the service life of the battery. It adopts a four stage charging method of constant current/W stage, constant voltage/small constant current, which has the characteristics of high charging efficiency, high reliability, easy operation, light weight, and small volume.

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