Battery Level Indicator 18650 Lipo Lithium Capacity Tester Meter 1S-7S 3.7V-29.4V 15mA Module Lithium Battery Display DIY Module Features: 1.Ultra thin battery display with 5 LED indicators for more intuitive and aesthetically pleasing display 2.With reverse connection function, even if the positive and negative connections are reversed, it will not burn 3.Small and exquisite appearance, easy to carry 4.Wider range of use, lithium batteries, lead-acid batteries, lithium iron phosphate, electric vehicle batteries, and electric equipment can all be used 5.Connect the positive and negative terminals of the display board to the positive and negative terminals of the tested battery, gently press the red button with your finger, and the IED light will light up to display the real-time battery level 6.Release your finger, the LED light will go out after a delay of 3-10 seconds, and it will not consume any power when stationary. Specifications: Allowable error: 2%; 4-stage battery: 25%, 50%, 75%, 100% Working current: 15ma Lead length: 15cm External dimensions: 40x 15x 2.5mm Working temperature: -10 ~65 Installation: 1. Connect the positive and negative terminals of the display board to the positive and negative terminals of the tested battery, gently press the red button with your finger, and the IED light will light up to display the real-time battery level 2. Release your finger, the LED light will go out after a delay of 3-10 seconds, and it will not consume any power when stationary. 3. Equipped with reverse connection function, even if the positive and negative connections are reversed, they will not burn, and can be adjusted Introduction: Lithium battery group displays battery parameters: (The following data are reference values, with a 2% error range. Do not take photos if high accuracy is required) Kind reminder: The 3.7V lithium battery uses 1 red power indicator light and 4 green battery indicator lights (for other voltage ranges, 1 red power indicator light and 4 blue battery indicator lights) (Note: N represents the number of battery cells) The first power indicator light is red Battery voltage greater than N 3.3V, bright second blue Battery voltage greater than N 3.5V, third blue on Battery voltage greater than N 3.7V, 4th blue on Battery voltage greater than N 3.9V, bright 5th blue Package Included: Battery indicator * 1