4 Series 30A 18650 Lithium Battery Protection Board 14.8V 16V with Cable

4 Series 30A 18650 Lithium Battery Protection Board (14.8V / 16V) with Cable is engineered to safeguard lithium-ion battery packs against overcharge, over-discharge, and overcurrent damage. Designed for 4S battery configurations, this board ensures safe operation while delivering stable performance for high-power projects such as e-bikes, power tools, and DIY energy storage systems.

Key Features:

• 4S Battery Support: Works with 4 series 18650 lithium cells, producing a nominal 14.8V pack (up to 16.8V fully charged).
• High Current Capability: Rated for 30A continuous discharge, making it suitable for demanding applications.
• Comprehensive Protection: Guards against overcharge, over-discharge, overcurrent, and short-circuit conditions.
• Balanced Charging: Built-in balancing function helps maintain equal cell voltages for longer battery life.
• Ready-to-Use Cable: Includes pre-soldered balance leads for quick connection and installation.

Technical Specifications:

• Battery Type: 18650 Lithium-ion (Li-ion)
• Configuration: 4 Series (4S) cells
• Nominal Voltage: 14.8V
• Fully Charged Voltage: 16.8V
• Continuous Discharge Current: 30A
• Overcharge Protection: ~4.25V ± 0.05V per cell
• Over-discharge Protection: ~2.5V ± 0.05V per cell
• Short Circuit Protection: Supported
• Balance Function: Active cell balancing during charge

Mechanical Specifications:

• PCB Material: FR-4 high-quality fiberglass
• Connector Type: Pre-attached balance cable for easy wiring
• Mounting: Screw holes provided for secure installation
• Heat Dissipation: Copper traces optimized for high current flow

Dimensions:

• Board Length: ~59 mm
• Board Width: ~45 mm
• Board Thickness: ~3 mm
• Cable Length: Approximately 100 mm (included harness)

Pinout and Wiring:

• B−: Connect to the battery negative terminal
• B1, B2, B3: Connect to intermediate cell positive terminals
• B+: Connect to the pack positive terminal
• P−: Output negative terminal to load/charger
• P+: Output positive terminal (shared with B+)
• Wiring Note: Always connect balance leads in correct order to avoid board damage. Refer to wiring diagram in datasheet.

Datasheet Reference:

• Refer to the manufacturer’s datasheet for detailed electrical parameters, recommended wiring diagrams, and test conditions.

Applications:

• DIY Power Banks: Assemble custom high-capacity battery packs with built-in safety.
• E-Bikes and Scooters: Protect battery packs in lightweight electric vehicles.
• Solar Energy Storage: Use in small-scale renewable energy storage systems.
• RC Models and Tools: Ensure reliable power delivery in hobby and workshop devices.

Equivalent Models:

• 4S 20A BMS: Lower current alternative for lighter loads
• 4S 40A BMS: Higher current version for heavy-duty packs
• 4S LiFePO4 Protection Board: Designed for LiFePO4 chemistry with similar 4S setup

Package Includes:

• 1 x 4 Series 30A 18650 Lithium Battery Protection Board (14.8V / 16V)
• 1 x Balance Cable Harness