18650 Battery Holder – PCB – 3 Cell | Secure Battery Mount

Product Configuration

This holder is a passive component but requires correct wiring for safe operation. Here is the standard configuration:

Battery Orientation:
- Insert the three 18650 batteries according to the + and – symbols printed on the PCB. Incorrect insertion can cause a short circuit.
- The batteries are connected in series. The positive (+) terminal of one cell is connected to the negative (-) terminal of the next.
Output Terminals:
- The total voltage output is available at the two main terminals on the PCB:
  - Positive Output (+): This is the positive terminal of the last cell in the series chain.
  - Negative Output (-): This is the negative terminal of the first cell in the series chain.
- The nominal output voltage will be approximately 11.1V (3.7V x 3) and can be up to 12.6V (4.2V x 3) when fully charged.
Connecting a BMS (Highly Recommended):
- For safe operation, you must connect a 3S Lithium-Ion BMS (Battery Management System).
- The BMS has two sets of connections:
  - B- (Battery Negative): Solder to the Negative Output (-) pad on the holder.
  - P- (Load Negative): This becomes the new negative output for your project.
  - B1 & B2 (Balance Wires): Solder these to the connection points between the cells. Your holder should have labeled pads for these (e.g., B1, B2, B3).
  - P+ (Positive Output): This is connected directly to the Positive Output (+) pad on the holder.
Final Project Connection:
- Your project’s positive wire should connect to P+ on the BMS.
- Your project’s negative wire should connect to P- on the BMS.

Secure Mount: A printed circuit board (PCB) designed to securely hold three 18650 lithium-ion batteries.
Series Connection: Typically wires the batteries in series to provide a higher output voltage (e.g., 3 cells ~ 11.1V nominal).
Integrated Protection: Often includes features like soldering pads for a protection module (BMS), polarity markings, and robust nickel-plated contacts.
Easy Integration: Provides solderable terminals for easy connection to your project’s wiring.
Stable Base: The rigid PCB acts as a stable platform, preventing battery movement and improving project reliability.

Description
Review

This 3-cell 18650 battery holder is a professional-grade mounting solution built on a sturdy printed circuit board (PCB). Unlike simple plastic holders, this unit is designed for permanent integration into electronic projects, DIY power packs, robotics, and custom equipment. Its primary function is to securely house three standard 18650 lithium-ion cells, connecting them in series to combine their voltages. This configuration provides a nominal output of 11.1V (3.7V per cell), making it ideal for applications requiring more power than a single cell can offer, such as high-power LEDs, motor controllers, or portable amplifiers.

The PCB-based design offers significant advantages. It includes large soldering pads for easy and reliable connection of wires or a Battery Management System (BMS) to ensure safe charging and discharging. The holder features nickel-plated steel spring contacts that ensure strong electrical connectivity while compensating for slight variations in battery size. Polarity symbols (+/-) are clearly printed on the board to prevent incorrect battery installation. This holder transforms loose batteries into a stable, safe, and easily manageable power source for any serious electronics project.

Robust Construction: The fiberglass PCB provides a durable, non-bending platform that protects battery contacts from stress and damage.
Enhanced Safety: The design allows for easy soldering of a BMS, which is critical for protecting lithium-ion batteries from overcharge, over-discharge, and short circuits.
Excellent Connectivity: High-quality spring contacts and wide solder traces ensure minimal power loss and reliable current delivery.
Space-Efficient Design: The compact layout holds three cells in a minimal footprint, ideal for internal project design.
Simplified Assembly: Pre-designed solder connections between cells reduce wiring complexity and potential points of failure.
Professional Results: Enables a clean, organized, and reliable power assembly for both hobbyist and professional applications.