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【Switching frequency】Switching frequencies up to 1MHz, compensate for voltage loss in ‑CV mode 【Automatic charging】The internal resistance and tracking resistance of the battery are charged automatically battery voltage is lower than the input voltage and battery short circuit 【Strong adaptability】This battery charging module is strong adaptable to the input power supply, driving capacity is limited over voltage battery 【Votage】Version 8.4V of input voltage DC 3‑6V (DC 3.7V 5V is recommended)