Intelligent Battery Display Lithium Battery Level Indicator 18650 Lipo Li-ion Capacity Board Charging Tester 1S-7S 37-252V Features: Using high-quality materials, durable Ultra-thin power display, 5 LED indicators, the display is more intuitive and more beautiful With reverse connection function, even if the positive and negative connections are reversed, it will not burn Small and exquisite appearance Wider range of use, lithium batteries, lead-acid batteries, lithium iron phosphate, electric vehicle batteries and electric equipment can be used Parameter: Allowable error: 2%; 4-stage power: 25% 50% 75% 100% Working current: 15ma Lead length: 15cm Dimensions: 40x 15x 2.5mm Working temperature: -10~65 Install: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test, press the red button lightly with your finger, and the IED light will light up to display the real-time battery level. Release your finger, the LED light will go out after a delay of 3-10 seconds, and it will not consume power at all when it is static. With reverse connection function, even if the positive and negative connections are reversed, it will not burn, just adjust it Lithium battery display battery parameters: (the following data are reference values, there will be a 2% error range, do not shoot if high accuracy is required) Reminder: 3.7V lithium battery uses 1 red power indicator and 4 green battery indicators (other voltage ranges are 1 red power indicator and 4 blue battery indicators) (Note: N is the number of battery cells) The first power indicator is red When the battery voltage is greater than N3.3V, the second blue light is on When the battery voltage is greater than N3.5V, the third blue light is on When the battery voltage is greater than N3.7V, the fourth blue light is on When the battery voltage is greater than N3.9V, the fifth blue light is on Style A Style B Style C Style D Style E Style F Style G Reminder: 1. The standard model requires a voltage regulator chip 78L05 for MCU power supply, and 78L05 will have a static current of about 2 NmA, so the monitor will consume 2 NmA of current. Please be aware! _x000D_ _x000D_ 2. Customers often report that a single lithium battery cannot run smoothly. After investigation, it was found that the charger they use is a 5V mobile phone charger. The 5V mobile phone charger is actually a 5V power supply and does not have the CC and CV functions of a lithium battery specific charger. It can charge the phone because there is a charging circuit inside the phone, while our monitor does not have this circuit. Therefore, when directly connected to the 5V power supply, there may be situations where the battery is empty and cannot be charged normally due to excessive current protection from the protection board, or when the battery is almost full, it cannot be charged normally due to overcharging protection from the protection board. Some people also say that when I connect the battery like this, it will eventually be fully charged. In fact, because your battery has been in an abnormal charging state, the charging current is definitely not high, so the monitor detects that the charging current is too low (below 200mA) and cannot determine the charging status. Product Features:_x000D_ 1. Equipped with battery charging indicator, the scrolling light indicates the charging progress of the battery, and the charging and discharging modes independently distinguish the power level, excluding the influence of battery internal resistance on battery power._x000D_ 2. When the battery is undervoltage, the red light flashes to prompt charging._x000D_ 3. Charging is detected by charging current, with simple wiring and no need to install charging recognition diodes._x000D_ 4. It does not affect the charging cut-off voltage, just use the original charger._x000D_ wiring method_x000D_ 1. Connect the red and black wires to the positive and negative terminals of the battery._x000D_ 2. Connect the white wire to the negative terminal of the charger. _x000D_ The selling point of this product is: 1. Ultra small size, ultra-thin: 3.9 * 1.5 * 0.4CM. Exposed opening 3.2 * 1.5CM. _x000D_