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Down limiting from 2 18650s in series to 5v works great. Had to fabricate way to mount as not built in to board.\n  \nRead more","asin_in_url":"B087RHWTJW","description":"DROK USB Power Supply Step Down Buck Converter Module for Mobile Fast Charging Parameters: Input voltage: 6V-32V (12V\/24V) Output voltage: default 5V; after triggering quick charging, it will be automatically adjusted at 3-12V. Output power: 24W max. (5V\/3.4A; 9V\/2.5A; 12V\/2A, etc.) Conversion efficiency: 90%-97% Dimension: 35*17*8.5mm Protections: Input over-voltage protection, Input under-voltage protection; Input over-current protection; Output over-current protection; Output short-circuit protection; Over-temperature protection. Supportable fast charging versions: BC 1.2; Apple; Samsung AFC; Huawei FCP; QC 2.0\/3.0; MTK PE 1.1\/PE 2.0; AFC; SFCP. Applications: Solar panel to mobile phone charging diy; Car charging system diy; Driving recorder power supply diy; Household power supply renovation diy. 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