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This 18650 lithium battery charging module comes with 2 pieces per set, designed for DIY power bank making. It features dual USB ports with 5V 2.4A stable output, able to supply power for mobile phones, tablets and other digital devices simultaneously. Integrated comprehensive safety protection functions effectively prevent overcharging, overdischarging and short circuit risks to protect batteries and equipment. The module is compact and easy to match with 18650 batteries, perfect for electronic enthusiasts DIY production, portable power supply modification and daily small power supply design.