4x21700 3.7V 4000mAh battery

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21700 3.7V 4000mAh Lithium-ion Batteries Rechargeable High Power Battery For Flashlight Mini Fan DIY E-Scooter Solar Light

Application

Power bank, microphone, radio microphone, gamepad, laser pointer, flashlight, headlight, LED light, camera, toy, remote control toy, mini fan, portable printer, printer emergency light, interphone, DVD portable computer, laptop, instrument, audio equipment, model antenna, and other electronic device.