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Compatible with Li-ion (Lithium ion), NiMH, or NiCd rechargeable batteries. Four independent channels can be set individually or all at once. Adjustable charging rate from 200 to 2000 mA. (1000 mA max for 4 channels) Each channel offers five operating modes: Charge, Discharge, Discharge Refresh, Charge Test, Quick Test. NiMH/NiCd sizes: AAAA, AAA, AA, A, C and SubC. Li-ion sizes: 10440, 14500, 14650, RCR123A (17340), 17500, 17670, 18350, 18500, 18650, 19670 (protected 18650), 25500, 26500, 26650. Maximum length 70mm