How to Use powerbank 18650: Examples, Pinouts, and Specs

The Powerbank 18650 by Arduino (Part ID: powerbank 18650) is a portable battery pack designed to store and provide power using 18650 lithium-ion cells. This versatile component is ideal for charging devices such as smartphones, tablets, and small electronic projects. Its compact design and rechargeable nature make it a reliable power source for on-the-go applications.

• Charging mobile devices (e.g., smartphones, tablets, smartwatches)
• Powering small electronic projects and development boards (e.g., Arduino, Raspberry Pi)
• Emergency backup power for portable devices
• DIY portable power solutions

The following table outlines the key technical details of the Powerbank 18650:

The Powerbank 18650 does not have traditional pins but includes the following ports and interfaces:

1. Install 18650 Cells: Insert one or two 18650 lithium-ion cells into the battery slots, ensuring correct polarity (+/-).
2. Charge the Powerbank: Connect a 5V DC power source (e.g., USB charger) to the Micro-USB or USB-C input port. The internal charging circuit will manage the charging process.
3. Power External Devices: Connect your device to the USB-A output port using a USB cable. The powerbank will automatically supply 5V DC to the connected device.

• Battery Selection: Use high-quality, protected 18650 cells with a capacity of at least 2000mAh for optimal performance.
• Polarity Check: Ensure the correct polarity when inserting the batteries to avoid damage to the powerbank.
• Charging Safety: Do not leave the powerbank charging unattended for extended periods.
• Load Limit: Avoid connecting devices that draw more than 2.1A, as this may trigger the overcurrent protection.
• Temperature: Operate the powerbank within a temperature range of 0°C to 40°C to prevent overheating.

The Powerbank 18650 can be used to power an Arduino UNO via its USB-A output. Below is an example of how to connect and use it:

1. Connect the USB-A output of the powerbank to the Arduino UNO's USB port using a USB cable.
2. The Arduino UNO will automatically power on and operate as usual.

Here is a simple Arduino sketch to blink an LED while powered by the Powerbank 18650:

// Simple LED Blink Example
// This sketch blinks the built-in LED on pin 13 of the Arduino UNO.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. Powerbank Not Charging

   • Cause: Faulty USB cable or power source.
   • Solution: Check the USB cable and ensure the power source provides 5V DC.

2. No Output Power

   • Cause: Batteries are not installed or are discharged.
   • Solution: Install fully charged 18650 cells and ensure correct polarity.

3. Device Not Charging

   • Cause: Device requires more than 2.1A or incompatible cable.
   • Solution: Use a compatible device and cable. Ensure the device's power requirements are within the powerbank's limits.

4. Overheating

   • Cause: Prolonged use at high current or high ambient temperature.
   • Solution: Allow the powerbank to cool down before further use. Avoid using it in hot environments.

Q1: Can I use unprotected 18650 cells with this powerbank?
A1: It is recommended to use protected 18650 cells to ensure safety and prevent overcharging or over-discharging.

Q2: How long does it take to fully charge the powerbank?
A2: Charging time depends on the capacity of the installed 18650 cells and the input current. For example, with a 1A charger and two 2600mAh cells, it may take approximately 6-8 hours.

Q3: Can I charge the powerbank and use it to power a device simultaneously?
A3: Yes, the powerbank supports pass-through charging, but this may reduce the charging efficiency.

Q4: What happens if I insert the batteries incorrectly?
A4: The powerbank includes reverse polarity protection, but it is always best to double-check the polarity to avoid potential damage.