Design with 18650 12V 3S Li-ion Battery in Cirkit DesignerThe 18650 12V 3S Li-ion Battery is a rechargeable lithium-ion battery pack composed of three 18650 cells connected in series. This configuration provides a nominal voltage of 12V, making it suitable for a wide range of applications. Known for its high energy density, lightweight design, and long cycle life, this battery pack is commonly used in portable electronics, electric vehicles, robotics, and backup power systems.
This circuit consists of three 18650 batteries connected in series to a 3S 10A Li-ion 18650 Charger Protection Board Module. The protection board manages the charging and discharging of the battery pack, ensuring safe operation by balancing the cells and providing overcharge, over-discharge, and short-circuit protection.
Open Project in Cirkit Designer
This circuit is a battery management and power supply system that uses three 3.7V batteries connected to a 3S 10A Li-ion 18650 Charger Protection Board Module for balanced charging and protection. The system includes a TP4056 Battery Charging Protection Module for additional charging safety, a Step Up Boost Power Converter to regulate and boost the voltage, and a USB regulator to provide a stable 5V output, controlled by a push switch.
Open Project in Cirkit Designer
This circuit is a battery management and charging system for a 4S Li-ion battery pack. It includes multiple 18650 Li-ion batteries connected to a 4S40A BMS for balancing and protection, a battery indicator for monitoring charge status, and an XL4016 module for voltage regulation. The system is designed to be charged via a 20V input from a charger.
Open Project in Cirkit Designer
This circuit is a power management system that integrates a 12V power supply, a solar charger power bank, and multiple Li-ion batteries to provide a stable power output. The Waveshare UPS 3S manages the input from the power sources and batteries, ensuring continuous power delivery. The MRB045 module is used to interface the solar charger with the rest of the system.
Open Project in Cirkit DesignerBelow are the key technical details of the 18650 12V 3S Li-ion Battery:
| Parameter | Specification |
|---|---|
| Nominal Voltage | 12.6V (fully charged) |
| Nominal Capacity | Typically 2000–3000mAh per cell |
| Configuration | 3 cells in series (3S) |
| Maximum Charging Voltage | 12.6V |
| Minimum Discharge Voltage | 9.0V (3.0V per cell) |
| Standard Charge Current | 0.5C (e.g., 1A for a 2000mAh pack) |
| Maximum Discharge Current | Typically 10A (varies by cells used) |
| Protection Circuit | Built-in Battery Management System (BMS) |
| Dimensions | Varies based on cell arrangement |
| Weight | ~150–200g (depending on cells used) |
The battery pack typically has two or three terminals for connection. Below is a description of the pins:
| Pin | Label | Description |
|---|---|---|
| 1 | + (Positive) | Positive terminal for power output |
| 2 | - (Negative) | Negative terminal for power output |
| 3 | BMS (Optional) | Optional terminal for monitoring or balancing |
Note: The exact pin configuration may vary depending on the manufacturer. Always refer to the specific datasheet or labeling on the battery pack.
+) to the positive rail of your circuit and the negative terminal (-) to the ground rail.The 18650 12V 3S Li-ion Battery can power an Arduino UNO via its barrel jack or VIN pin. Below is an example of connecting the battery to an Arduino UNO to power an LED:
// This code blinks an LED connected to pin 13 of the Arduino UNO.
// Ensure the battery voltage is within the Arduino's operating range (7-12V).
void setup() {
pinMode(13, OUTPUT); // Set pin 13 as an output pin
}
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
}
Warning: Ensure the battery voltage does not exceed the Arduino's maximum input voltage (12V) to avoid damage.
Battery Not Charging
Battery Drains Quickly
Battery Overheats
No Output Voltage
Q1: Can I use this battery pack without a BMS?
A1: It is not recommended to use the battery pack without a BMS, as it protects the cells from overcharging, over-discharging, and short circuits.
Q2: How do I know when the battery is fully charged?
A2: The battery is fully charged when the voltage reaches 12.6V. Most chargers have an indicator light to signal full charge.
Q3: Can I connect multiple 18650 12V 3S packs in parallel?
A3: Yes, you can connect multiple packs in parallel to increase capacity, but ensure all packs are at the same voltage level before connecting.
Q4: What is the lifespan of this battery pack?
A4: The lifespan depends on usage and charging cycles. Typically, it lasts for 300–500 charge cycles under normal conditions.
By following the guidelines and best practices outlined in this documentation, you can safely and effectively use the 18650 12V 3S Li-ion Battery in your projects.