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A camera battery with a built-in USB-C charger wins today's 'I didn't know I needed this' prize | TechCrunch
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Renogy 12V 100Ah LiFePO4 Deep Cycle Lithium Battery w/ Built-In Bluetooth BMS 2000 Cycles, Backup Power Perfect for Off-Grid RBT100LFP12-BT-US - The Home Depot
batteries - Does this mini LiPo battery have a built-in BMS? - Electrical Engineering Stack Exchange