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The for shell is high-quality materials, The negative of the slot is designed with a retractable spring, which can various specifications of lithium batteries such as 18650, 18490, 14500, 16340, and 10440. USB charging, low voltage, safe, can be connected to cell phone computers, for charging, simple and convenient. With an LED the light is for always on when the is charged, and the green light is for always on when the is fully charged empty. Adopt intelligent ICchip, automatic stop when full, with output short circuit, anti-battery reverse connection for protection, to ensure charging safety.