- Ultra-thin design with an electricity display and 5 LED indicators for an intuitive and visually appealing experience. - Simple connection: Attach the positive and negative terminals of the display board to the corresponding terminals on the battery being tested. - Real-time battery monitoring: Press the red button to illuminate the LED lamp, providing immediate feedback on battery power levels. - Energy-efficient: Release the button, and the LED light turns off after a 3-5 second delay, ensuring no power is consumed while idle. - Voltage range: Suitable for batteries with a voltage of 3.7V to a maximum of 4.2V. Applications: - Perfect for testing lithium-ion batteries in electronic devices, ensuring optimal performance and longevity. - Ideal for hobbyists and professionals working with rechargeable batteries, providing quick and accurate power assessments. - Useful for maintenance and troubleshooting in various electronic equipment, helping to prevent unexpected power failures.