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This product can charge 2 or 4 AA / AAA and 2 6f22 (9V) Ni MH / Ni Cd rechargeable batteries. It can only charge 2 batteries in series, not single battery. After 6 hours of continuous charging, the LED will go out. Constant current and voltage make battery life longer. Charge retention: goodHigh frequency discharge performance: goodProduct certification: CeRated capacity: 280.300.500Battery type: 9VLife cycle: 1000Internal resistance: 30Standard voltage: 9Brand: BTYArticle No.: 802 charging kitApplication: toy, remote controlSpecifications: European and American specificationsChemical type: NIMH This product can charge 2 or 4 AA / AAA and 2 6f22 (9V) Ni MH / Ni Cd rechargeable batteries. It can only charge 2 batteries in series, not single battery. After 6 hours of continuous charging, the LED will go out. Constant current and voltage make battery life longer.