4S 12V 100A 18650 LiFePO4 and Lithium Battery BMS Protection Board with Balance

4S 12V 100A 18650 LiFePO4 and Lithium Battery BMS Protection Board with Balance is a heavy-duty high-current 4-series (4S) Battery Management System (BMS) PCB engineered for high-power 12V/14.8V lithium battery banks. Featuring a massive multi-MOSFET power stage rated for 80A–100A discharge current and up to 60A charging current, integrated 60mA cell voltage balancing, temperature sensor protection, and wire-disconnection safeguard, it protects high-capacity solar inverters, e-bikes, trolling motors, and automotive jump-starter packs.

Key Features:

• High-Power 80A–100A Discharge / 60A Charge Rating: Heavy-copper PCB with a parallel array of low-$R_R_DS(on) power MOSFETs handles up to 80A continuous (100A overcurrent protection threshold) and 60A charging current.
• Built-In 60mA Passive Cell Balancing: Integrated bleed resistors equalize individual cell voltages at 60mA per channel during charging so all 4 series cell groups stay balanced.
• 6-Fold Comprehensive Safety Protection: Includes overcharge protection, over-discharge protection, 100A overcurrent cut-off, fast 100–600µs short-circuit protection, NTC over-temperature cut-off, and sense-wire disconnection protection.
• Supports 3S / 4S Multi-String Configuration: Designed primarily for 4S (4-series) packs with jumper-configurable string support for ternary Li-ion (3.7V) / LiFePO4 applications.
• Heavy-Duty Solder & Screw/Lug Terminal Pads: Large tinned busbar pads accommodate thick 8–10 AWG battery and inverter cables.

Technical Specifications:

• Supported Pack Configuration: 4S (4 Series Cells; Adjustable for 3S/4S Strings)
• Overcharge Protection Current / Continuous Discharge: 80A Continuous / 100A Protection Limit
• Maximum Charging Current: 60A Max
• Single-Cell Overcharge Detection Voltage: 4.21V to 4.29V (Release: 4.14V to 4.24V | Delay: 1.5s–2.5s)
• Single-Cell Over-Discharge Detection Voltage: 2.72V to 2.88V (Delay: 0.5s–1.5s)
• Cell Balancing Current: 60 mA Passive Bleed Balancing
• Short-Circuit Protection Delay: 100 µs to 600 µs (Auto-Recovery)
• Additional Protections: Thermal NTC Protection & Balance Wire Disconnection Protection

Mechanical Specifications:

• PCB Material: Heavy-Copper White FR-4 Fiberglass PCB with High-Current Power MOSFET Bank
• Interfaces: High-Current `B-`, `C-`, `P-` Bus Pads + Multi-Pin Balance Connector

Dimensions:

• Length: ~70 mm to 80 mm
• Width: ~50 mm to 55 mm
• Thickness: ~10 mm
• Weight: ~45 g

Pinout and Wiring:

• B-: Connect with heavy-gauge cable (8–10 AWG) directly to Pack Negative (Cell 1 Negative).
• P-: High-current discharge negative output to inverter or motor load (80A–100A).
• C-: Dedicated charge negative input to charger (up to 60A).
• Balance Harness (`B-`, `B1`, `B2`, `B3`, `B4`/`B+`): Connect sequentially from Cell 1 Negative up to Cell 4 Positive before plugging the balance connector into the BMS board.

Datasheet Reference:

• Protection Architecture: Multi-String Hardware BMS Controller IC + 60mA Balance Bleed Array + High-Current Parallel MOSFET Stage

Commonly Used in:

• 12V / 14.8V Solar Off-Grid Inverter Battery Banks
• Electric Bicycles, Scooters, Rickshaws, and Marine Trolling Motors
• High-Current 12V Car Audio & Portable Power Stations
• Heavy-Duty UPS Backup Systems

Applications:

• Protects large 4S 50Ah–100Ah+ lithium battery banks driving 500W–1000W 12V AC inverters.
• Provides separate `P-` (80A–100A discharge) and `C-` (60A charge) paths alongside 60mA cell balancing and thermal protection.
• Pairs with a `4S 1.2A Lithium Battery Active Equalizer Module` (`PID 48295`) when active balancing is desired for large-capacity cells.

Equivalent Models:

• 4S 40A 18650 Lithium Battery Protection Board: Compact 40A 4S BMS board for medium-power drills and solar packs.
• 4S 30A High Current Li-ion Lithium Battery 18650 Charger Protection Board Module: 30A 4S BMS module.

Package Includes:

• 1 × 4S 12V 100A 18650 LiFePO4 and Lithium Battery BMS Protection Board with Balance