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The RCR123A charger charges your batteries to a maximum of 3.7v. This is the max charge for LiFePO batteries. Li-ion batteries by contrast charge up to 4.2v. (The nominal voltage for LiFePO batteries is 3.0 volts, Li-ion batteries are rated at 3.7v.) Only use this unit to charge LiFePO batteries. When finished, the charging light will turn from red to green. Charge time is generally a few hours, but varies.