JK Smart Active Balance BMS Board 3S-8S 40A 0.4A Balance Current With UART/RS-485
The JK Smart Active Balance BMS Board rated for 3-8 cells in series (3S-8S) with 40A continuous current and 0.4A active balancing is engineered for battery packs needing good performance without going into the very high-power bracket. It offers protection, balance, and communication for LiFePO₄, Li-ion, and similar chemistries, and its design makes it a solid choice for middle-tier applications.
Key Features & Specs
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Series Compatibility: Works with battery packs that have between three to eight cells in series. This means nominal voltages from around 9V (3S) up to roughly 32-34V (8S), depending on cell chemistry.
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Current Handling: The board supports up to 40A for continuous discharge (and often similar for charge), with peak currents somewhat higher for short durations under certain circumstances.
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Active Balancing @ 0.4A: Rather than merely passively bleeding off excess charge (which wastes energy), this board actively moves charge between cells at 0.4 amps. This helps keep cells matched more quickly and evenly, improving lifespan and performance.
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Smart Communication: Provides UART and RS-485 interfaces for monitoring, logging, and configuration. Users can see cell voltages, pack status, temperature, etc., via apps or external controllers. Some versions also include Bluetooth or optional CAN.
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Protection Mechanisms: Over-charge, under-charge, over-current, short-circuit, temperature limits, and adjustable voltage thresholds are built in. Also, accurate voltage measurement (±3-5 mV) aids in reliable monitoring.
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Common Port Wiring: Charge and discharge share common main terminals to simplify wiring. Balance leads (one per cell) allow the board to monitor and balance individual cells.
Applications & Strengths
This BMS board works well for electric bikes, portable power packs, small solar-energy storage, robotics, backup systems, and other setups where 30-50A class loads are expected. It gives users a good margin of safety with built-in protections and decent balancing speed. The active balance current of 0.4A is not super high, so balancing will take longer on large capacity packs, but for many moderate-size systems it is entirely sufficient.
Considerations & Best Practices
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Use appropriately thick wires and good connectors so that 40A flows without excessive voltage drop or heating.
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Monitor temperature of the BMS and ensure some ventilation or heat sinking, especially under heavy use.
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Verify that your chosen cell chemistry and cell voltage limits match those set in the BMS; adjust parameters via the communication interface if needed.
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Regularly check balance-lead connections and ensure every cell is connected properly; poor balance wiring undermines balancing.
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Don’t continuously run loads at or well beyond the 40A rating—for safety and longevity, allow some margin.
In summary, the JK Smart 3S-8S 40A 0.4A Active Balance BMS with UART/RS-485 is a strong middle ground: capable, smart, and well-suited for many lithium battery applications where performance, safety, and moderate balancing speed matter.
Contact
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kruthala@srikobatteries.com
1585 Beverly CT, Unit 121, Auror
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