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Check the listing for details. High Current CC/CV 3A 4.2V Polymer Ternary Lithium Battery Quick Fast Charging. Condition: New. Listed at 1.55 USD. Default 3A, remove resistor 2A, replace with 135k resistor 1A. Charging current: 3A (can change current by adjusting resistance). Conversion efficiency: 3A 93%, 2A 94%, 1A 95% (data is for reference only).