Overview: JK BMS 4S to 8S 0.4A Active Balancer 60A Smart Bluetooth BMS
The JK BMS 4S-8S with 0.4A active balancing and 60A continuous current is an entry-level smart battery management system from JIKONG, designed for low to medium power lithium battery packs. It supports Li-ion (3.7V), LiFePO4 (3.2V), and LTO (2.4V) chemistries, making it a flexible choice for DIY solar storage, e-bike packs, scooters, and small backup systems.
Key Features of JK BMS 4S to 8S Active Balancer
- Cell range: 4S to 8S configurable via JK BMS app
- Active balancing current: 0.4A (energy transfer balancing, not passive bleeding)
- Continuous charge and discharge: 60A
- Communication: Bluetooth 5.0, RS485, CAN, UART
- Supported chemistries: Li-ion, LiFePO4, LTO
- Temperature sensors: 2 x NTC included
- Protection: overcharge, overdischarge, overcurrent, short circuit, temperature
- Mobile app: JK BMS (Android and iOS)
- Aluminum housing for superior heat dissipation
- Real-time monitoring of voltage, current, temperature, and SOC
Why Active Balancing Matters for Battery Packs
Unlike passive balancing that wastes excess energy as heat, active balancing transfers energy from higher voltage cells to lower voltage cells. This extends battery pack life, improves usable capacity, and reduces wasted energy, especially important for LiFePO4 packs where cell drift over time is common.
Benefits of Active Balancing Technology
- Extends overall battery pack lifespan by 20-30%
- Maximizes usable capacity from all cells
- Reduces heat generation compared to passive balancing
- Maintains cell balance even during charge and discharge cycles
- Especially effective for LiFePO4 chemistry where voltage curves are flat
Smart Bluetooth Connectivity and Mobile App Control
The built-in Bluetooth 5.0 module allows wireless connection to the JK BMS mobile app, available for both Android and iOS devices. Monitor your battery pack in real-time, adjust protection parameters, view historical data, and receive alerts directly on your smartphone.
JK BMS App Features
- Real-time voltage monitoring for each cell
- Current, power, and state of charge (SOC) display
- Temperature monitoring from dual NTC sensors
- Customizable protection parameters
- Historical data logging and export
- Firmware updates over Bluetooth
- Battery health diagnostics
Multiple Communication Protocols for System Integration
The JK BMS 4S-8S comes equipped with RS485, CAN bus, and UART communication ports, enabling seamless integration with solar inverters, charge controllers, and monitoring systems. This makes it ideal for professional solar storage installations and advanced DIY projects.
Compatible Systems
- Victron Energy inverters and MPPT controllers
- Growatt hybrid inverters
- DEYE and Sol-Ark systems
- Custom Arduino and Raspberry Pi projects
- Home automation and monitoring platforms
Common Use Cases and Applications
- 12V to 24V LiFePO4 solar storage banks (up to 60A loads)
- E-bike and electric scooter battery packs
- Small home backup and UPS battery builds
- Marine and RV battery systems
- Electric golf carts and utility vehicles
- Portable power stations and camping setups
- Off-grid cabin and tiny home energy storage
Technical Specifications
| Model | JK BMS 4S-8S 0.4A 60A |
| Cell Configuration | 4S to 8S (configurable) |
| Active Balance Current | 0.4A |
| Continuous Current | 60A charge/discharge |
| Supported Chemistry | Li-ion, LiFePO4, LTO |
| Communication | Bluetooth 5.0, RS485, CAN, UART |
| Temperature Sensors | 2 x NTC (included) |
| Protection Features | Overcharge, overdischarge, overcurrent, short circuit, temperature |
| Housing Material | Aluminum (heat dissipation) |
| Mobile App | JK BMS (Android/iOS) |
What’s Included in the Box
- 1 x JK BMS unit (4S-8S 0.4A 60A)
- 2 x NTC temperature sensors with cables
- Balance lead harness
- User guide and documentation
- Mounting accessories
Installation and Setup Guide
Installing the JK BMS 4S-8S is straightforward for anyone with basic electrical knowledge. Connect the balance leads to each cell, attach the main positive and negative terminals, mount the temperature sensors, and configure the BMS via the mobile app according to your battery chemistry and requirements.
Installation Tips
- Ensure proper polarity when connecting balance leads
- Mount the BMS in a well-ventilated area
- Place temperature sensors on different cells for accurate monitoring
- Configure chemistry settings before first use
- Test all protection features before connecting loads
- Keep firmware updated for optimal performance
Availability and Warranty in Pakistan
This product is available across Pakistan with shipping from Hybrid EV Engineering, Rawalpindi. We offer technical support, installation guidance, and a 6-month warranty on all JK BMS units against manufacturing defects.
For bulk orders, custom configuration help, or compatibility queries with your specific battery pack, contact us before placing the order. Our team of experts can assist with system design, component selection, and troubleshooting to ensure your battery management system performs optimally.
Why Choose Hybrid EV Engineering for Your BMS Needs
- Authorized distributor of genuine JK BMS products
- Expert technical support and consultation
- Fast shipping across Pakistan
- Competitive pricing with warranty coverage
- Installation guidance and after-sales service
- Bulk order discounts available
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