Quick Specifications
| Model | JK-BD4A20S4P |
|---|---|
| Dimensions | 110 x 73 x 17 mm |
| Material | Aluminum Alloy Heat Sink & PCB |
| Balance | 0.4A Active Equalization |
| Cont. Current | 40A |
| Peak Current | 60A |
| Strings | 7S~20S (Li-ion) / 8S~24S (LiFePO4) / 14S~20S (LTO) |
| Accessories | Sampling wires, Built-in Bluetooth, 3x NTC Temperature sensors |
| Application Scenarios | Scooters, shared cars, tiny sightseeing cars |
Quick Specifications
| Model | JK-BD4A20S4P |
|---|---|
| Dimensions | 110 x 73 x 17 mm |
| Material | Aluminum Alloy Heat Sink & PCB |
| Balance | 0.4A Active Equalization |
| Cont. Current | 40A |
| Peak Current | 60A |
| Strings | 7S~20S (Li-ion) / 8S~20S (LiFePO4) / 14S~20S (LTO) |
| Accessories | Sampling wires, Built-in Bluetooth, 3x NTC Temperature sensors |
| Application Scenarios | Scooters, shared cars, tiny sightseeing cars |
Product Overview
The JK-BD4A20S4P is a 40A smart BMS with 0.4A active balancing, designed for small to mid-size lithium packs from 7S to 20S. It supports Li-ion (7S~20S), LiFePO4 (8S~24S), and LTO (14S~20S) in a compact 110 x 73 x 17 mm form factor.
Even at this size, active balancing moves energy between cells rather than burning it off, so small packs stay balanced longer and deliver more usable capacity. With 60A peak output, full protection coverage, and Bluetooth app control, it is a practical choice for scooters, shared cars, and portable storage.
Core Features
- 0.4A Active Balancing: Energy-transfer balancing keeps small packs equalized without heat waste, unlocking more usable capacity.
- 40A Continuous / 60A Peak Output: Compact 2.8mΩ MOSFET design delivers reliable power for light-duty packs.
- Wide Chemistry Compatibility: Li-ion 7S~20S, LiFePO4 8S-24S, LTO 14S-20S on one board; 20~100V working voltage.
- ±5mV Voltage Accuracy: Cell-level precision with a built-in coulomb counter for accurate SOC tracking.
- Full Protection Suite: Overcharge, over-discharge, adjustable overcurrent (10A-40A adjustable), overtemperature, and short-circuit protection; same-port charge/discharge.
- Bluetooth App + Optional GPS: Monitor and configure via Android/iOS app; GPS remote control and RS485/CAN available on request.
Application Scenarios
Built for systems that work hard every day, the JK-BD4A20S4P fits Scooters, shared cars, tiny sightseeing cars.
Frequently Asked Questions
Which battery packs is the JK-BD4A20S4P compatible with?
The JK-BD4A20S4P supports 7S~20S (Li-ion) / 8S~24S (LiFePO4) / 14S~20S (LTO) lithium battery packs — covering Li-ion, LiFePO4 and LTO chemistries (see the specification table above for the exact range per chemistry). It delivers 40A continuous discharge current, making it a solid choice for solar energy storage, RV power systems and industrial backup power.
How does the 0.4A active balancing on the JK-BD4A20S4P work?
Instead of burning excess charge off as heat like a passive balancer, the JK-BD4A20S4P transfers energy from higher-voltage cells to lower-voltage cells at up to 0.4A. This keeps every cell at a uniform voltage, extends overall pack life and greatly reduces heat during charging.
Can I monitor the JK-BD4A20S4P from my phone?
Yes. The JK-BD4A20S4P has built-in Bluetooth and connects to the JK BMS smartphone app, where you can check individual cell voltages, pack current, temperature readings and state of charge in real time. An optional GPS module adds remote location tracking for deployed systems.
Do you offer wholesale pricing or custom versions of the JK-BD4A20S4P?
Yes. JKBMS supplies the JK-BD4A20S4P to battery pack assemblers, distributors and brands worldwide. Click Request a Quote above for wholesale pricing, OEM/ODM customization options and lead times.