How to Make a 50,000 mAh Power Bank from Scrap Laptop Battery
List Of Materials
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12.6V 13.6V Li-ion Lithium Battery Charger Protection Board
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6-24V to 5V USB Step Down Module
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3.7V 3400mAh 18650 Lithium Rechargeable Battery
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20pcs 18650 Lithium Cell Case Holder
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