Working voltage: 3-34V, working current: 5mA, working temperature: -20-50℃ Using Method: connect display board positive and negative port with tested battery positive and negative port, digital tube will display real-time battery electricity quantity. Note: This model is not waterproof, the electronic components should be used in a dry environment. Wide application fields: lithium battery Four-level power display(Blue/Green optional) Features: 1. Battery type electricity quantity display 2. Working voltage: 3-34V, working current: 5mA, working temperature: -20-50℃ 3. Digital Color: outline red, display block blue/green (when battery electricity quantity is full, it will be all on) 4. Note: This model is not waterproof, the electronic components should be used in a dry environment. 5. Wide application fields: lithium battery 6. Using Method: connect display board positive and negative port with tested battery positive and negative port, digital tube will display real-time battery electricity quantity. Note that the connection is a few series of lithium batteries, we need to connect the corresponding pads in the corresponding tin. For example, the measured 2S battery (i.e., two 3.7V lithium batteries in series), it is necessary to short-circuit the corresponding pads on the S2 of the board. Pay attention to the selection of the corresponding number of battery strings, to be used in the corresponding voltage range. Do not exceed the maximum voltage of 4.3*N. (For example, choose the pad of S3 on the tin, then the module detection of the maximum do not exceed 4.3 * 3 = 12.9V) Battery Pack Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity. (note :N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity. 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity. 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity. 5.When battery voltage is less than N*3.3V, 4 blocks display will be off; it represents battery is less than 3.3V, and you can charge the battery. Package Includes: 5pcs Lithium Battery Capacity Indicator Module