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The lithium battery protection board can prevent the battery from overdischarging and overcharging, with a short circuit protection function, high current protection, etc. ... such as a single lithium battery protection board, the protective plate is opened to limit the maximum charge Current and maximum charge voltage, usually charged to 4.2V protection board will automatically stop charging the battery. Discharge protection board will limit the discharge current, put to a certain extent, such as 3.0V, the protection board will stop the discharge.