⚙️ Product Description

The 2S 3A Li-ion Battery Management System (BMS) protection board is designed for 2-cell lithium battery packs connected in series. It safely manages charging and discharging of 18650 lithium-ion or LiPo cells while protecting the battery pack from damage.

This compact PCB is ideal for low-current battery-powered applications such as mini drill motors, portable electronics, LED lighting, DIY battery packs, robotics, and small electronic projects.

The module includes protection against overcharging, over-discharging, short circuits, and excessive current. By maintaining safe operating conditions, it helps extend the lifespan and performance of your lithium battery pack.

⚙️ Specifications

• Module Type: 2S Lithium Battery Management System (BMS)
• Battery Configuration: 2S (2 Cells in Series)
• Compatible Battery Types: 18650 Li-ion / LiPo Cells
• Maximum Continuous Current: 3A
• Peak Current: Up to 5A
• Charging Voltage: 8.4V Max
• Recommended Charger Voltage: 8.4V DC
• Overcharge Protection Voltage: 4.25V ±0.05V per cell
• Over-discharge Protection Voltage: 2.5V ±0.1V per cell
• Overcurrent Protection: Yes
• Short Circuit Protection: Yes
• Balancing Function: No
• Module Dimensions: Approx. 41 mm × 16 mm × 3 mm

⚙️ Weight

• Approximate Weight: 2 g – 5 g

⚙️ Key Features

• Designed for 2S lithium battery packs
• Supports up to 3A continuous current
• Protects against overcharge and over-discharge
• Includes overcurrent and short-circuit protection
• Compact and lightweight PCB design
• Suitable for 18650 and LiPo battery cells
• Easy to install in DIY battery packs and portable devices
• Improves battery safety and reliability

⚙️ Terminal Configuration

• B+ : Battery Pack Positive
• B– : Battery Pack Negative
• BM : Middle Connection Between the Two Cells
• P+ : Charge/Discharge Positive
• P– : Charge/Discharge Negative

⚙️ Applications

• Drill motor battery packs
• Mini cordless tools
• DIY 2S 18650 battery packs
• Portable electronics and power banks
• Robotics and RC projects
• LED lighting systems
• Small DC motor applications
• DIY electronics and battery-powered projects

⚙️ Compatible With

• 2 × 18650 Lithium-ion Cells in Series
• 7.4V Nominal Battery Packs
• 8.4V Lithium Battery Chargers
• LiPo Battery Packs with 2 Cells

⚙️ Package Includes

• 1 × 2S 3A Li-ion 18650 Charger PCB BMS Protection Board

Note: This board is intended only for 2S lithium battery packs. Do not use with LiFePO4, lead-acid, or other battery chemistries. Always connect B+, B–, and BM correctly before applying power or connecting the charger.