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Check the listing for details. 3.2V 3.7V Solar Charge Controller Board Lithium Battery Charging Controller. Condition: New. Listed at 8.94 USD. Circuit Board: Compatible with 3.7V lithium battery, 3.2V lithium iron phosphate battery, 6V12V battery. The identification range of 3.2V single section of lithium iron is 2.5-4V. The identification range of 3.7V single section lithium battery is 3-4.4V.