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Amazon.com: MakerFocus 4pcs 186 50 Battery Charger Protection Module,Power Bank PCB Module Board,Dual USB 5V 1A 2.1A with BMS Protection for Phone DIY Mobile Power Bank : Cell Phones & Accessories
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Amazon.com: MakerFocus 6pcs 2A 5V Charge Discharge Integrated Module 3.7V 4.2V for 186 50 Lithium Battery Charging Boost Mobile Power Protection PCB Board Module : Electronics
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Amazon.com: MakerFocus 4pcs 186 50 Battery Charger Protection Module,Power Bank PCB Module Board,Dual USB 5V 1A 2.1A with BMS Protection for Phone DIY Mobile Power Bank : Cell Phones & Accessories
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