Two Voltage 18650 Lithium Battery Shield Mobile Power Expansion Board Module 5V/3A 3V/1A Micro USB For Arduino ESP32 ESP8266 _x000D_ Product Features 1. Protection mechanism 2. Input overvoltage protection 3. Output overcurrent/short circuit protection 4. Charging timeout/overvoltage protection 5. Temperature protection 6. Output current up to 3A, efficiency up to 95% 7. Equipped with LED recognition percentage electricity metering Product parameters 1. This mobile power bank is equipped with a built-in lithium battery protection IC, which provides overcurrent, overvoltage, undervoltage, and over temperature protection 2. USB port output and the mobile power board have expansion ports of 3V and 5V output ports, which greatly reduce the problem of limited ports for customer needs and usage The 3.5-level LED light displays the battery level, and it is in working mode by default when turned on. It needs to be manually turned off (if you need to change it to non working automatic shutdown mode, simply turn the toggle switch to non working automatic shutdown mode) 4.1.5A charging 3A discharging high integration mobile power IC 5. Motherboard size: 99.16mm * 29.28mm * 21mm (length * width * height) 6. Input port: MICROUSB (Android port) 7. Input requirements: A 5V constant voltage power supply can be used as a charging power input, matched with a charger of 5V1A or above 8. Output port: USB or expansion port 9. Output parameters 5V/3A or 3V/1A 10. Conversion efficiency up to 95% (high conversion rate) 11. Working temperature: -20 ~70 Operating instructions 1. Click to power on 2. Press the button three times to turn off//(non automatic shutdown mode) If you need to change to non working automatic shutdown mode, please refer to the third point of the product parameters above 3. Charging power display instructions: 100% (all five LEDs are on) 80-99% (D5 is flashing) 60-80% (D4 is flashing) 40-60% (D3 is flashing) 20-40% (D2 is flashing) 0-20% (D1 is flashing) 4. Discharge power display instructions: 80-100% (all five LEDs are on) 60-80% (D5 lights off) 40-60% (D4, D5 lights off) 20-40% (D3, D4, D5 off) 5-20% (D2, D3, D4, D5 off) 1-5% (D1 flashing) 0% (all off) 5. Intelligent input and output, no need to worry about long charging time, eliminating users' worries Application area 1. Mobile power bank 2. Other battery powered devices Matters needing attention 1. Do not reverse the positive and negative poles. Any damage caused by human error will be at your own risk. Please do not reverse the polarity 2. The battery voltage works normally between 3.2V-4.2V. Do not connect the batteries in series as it will increase the voltage. If the battery capacity needs to be increased, connect them in parallel. Do not connect them in series inventory Mobile power bank expansion board * 1 _x000D_