Why is the shell of the charging pin burnt when charging the Xiaomi Smart Band 10 in reverse?

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div:last-child { margin-right: 0 }The Xiaomi Smart Band 10 is only compatible with the original charging dock for charging. Other non-standard charging cables cannot be used. If other non-standard charging cables are used, the entire device will burn out or other abnormalities will occur. Reverse charging is prohibited for the band. If problems are caused by using non-standard charging cables, free after-sales service is not supported. For your reference, here are more details about reverse charging of the band:1. If the magnet on the charging dock doesn’t work, please apply to the after-sales service center for processing. If emergency charging is required, please charge in the direction shown in the figure;2. The band is not designed for reverse charging. Applying power incorrectly can cause excessive current or voltage, overheating the charging pins.