The 8S 24V/33.6V Li-ion Polymer Battery Balance Charger is a high-performance BMS (Battery Management System) protection circuit board designed for 8-cell (8S) lithium-ion and lithium-polymer battery packs. It provides comprehensive protection, cell balancing, and charging management for battery packs with a nominal voltage of 24V and a full charge voltage of 33.6V. This board is an essential component for e-bikes, energy storage systems, power tools, and other high-voltage applications requiring reliable battery safety and performance.
At the heart of the board is a BMS protection circuit that continuously monitors the voltage of each cell and the total pack current, disconnecting the load or charger if any parameter exceeds safe limits. This protects both the battery pack and your connected devices from damage, extending battery lifespan and ensuring safe operation.
The board provides three critical protection functions:
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Overcharge protection — Disconnects the charger when any cell voltage reaches approximately 4.25V to 4.3V, preventing damage from excessive charging.
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Over-discharge protection — Disconnects the load when any cell voltage drops to approximately 2.5V to 3.0V, preventing deep discharge that can permanently damage the battery.
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Overcurrent protection — Disconnects the output when current exceeds safe limits, protecting against short circuits and excessive loads.
The 8S configuration means the board manages eight cells in series, balancing the voltage across all eight cells to ensure they charge and discharge evenly. This cell balancing function is critical for maintaining pack health and maximizing lifespan. Without proper balancing, one cell can become overcharged or over-discharged, leading to premature failure or safety hazards.
The 8S configuration provides a nominal voltage of 24V (using 3.0V nominal LiFePO4 cells) or 29.6V (using 3.7V nominal lithium-ion cells), with a full charge voltage of 33.6V (using 4.2V per cell). This makes it suitable for a wide range of high-voltage applications that require more power than lower cell count packs.
The board features solder pads or connector pins for easy integration into battery packs. The exposed pads allow you to solder wires directly to the board, while also being compatible with standard connectors for modular pack designs. The board includes connection points for each cell mid-point (BM1 through BM7), plus B+, B-, P+, and P- for battery, charge, and discharge connections.
The wide application range includes:
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E-bikes — High-power protection for 24V and 36V electric bicycles
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Energy storage systems — Protect 8S battery packs in solar storage
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Power tools — High-current protection for professional-grade tools
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Electric scooters — Safe power for personal mobility devices
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Portable power stations — High-capacity protection for portable power
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LED lighting systems — Reliable power for high-power LED arrays
Important Note: This BMS is designed for 8S (8-cell) 24V/33.6V lithium battery packs. For other configurations, a different protection board or BMS should be used. Always verify the voltage and current ratings match your application before installation. Ensure all wiring and connections are rated for the maximum current your application will draw.
Whether you are building a custom 8S battery pack for an e-bike, assembling an energy storage system, or adding safety protection to a power tool, the 8S 24V/33.6V Li-ion Polymer Battery Balance Charger provides a reliable solution. It is suitable for individual makers, engineers, and businesses purchasing in bulk for product development or industrial applications.
Features
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8S eight-cell protection — Manages eight cells in series with cell balancing
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Balance charging — Ensures even charge and discharge across all eight cells
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Comprehensive protection — Overcharge, over-discharge, and overcurrent protection
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BMS protection circuit — Complete battery management solution
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Wide voltage range — 24V nominal / 33.6V full charge
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Solder pad design — Supports direct soldering and connector integration
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Compact PCB design — Sized for space-constrained battery packs
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Wide application range — E-bikes, energy storage, power tools, LED lighting
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Battery | 8S lithium-ion / lithium-polymer |
| 2 | Nominal Voltage | 24V (3.0V/cell) / 29.6V (3.7V/cell) |
| 3 | Full Charge Voltage | 33.6V |
| 4 | Overcharge Protection Voltage | ~4.25V – 4.3V per cell |
| 5 | Over-discharge Protection Voltage | ~2.5V – 3.0V per cell |
| 6 | Balance Function | Yes |
| 7 | Connection Type | Solder pads / connector pins |
| 8 | Module Dimensions | Compact PCB for 8S packs |
