JKBMS
JKBMS Active Balance BMS for Engine Starting | 2500A Peak Starting Current | JK-QB2A8S-20P Series
JKBMS Active Balance BMS for Engine Starting | 2500A Peak Starting Current | JK-QB2A8S-20P Series
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JKBMS JK-QB2A8S-20P Series — Active Balance Starting BMS
The JKBMS JK-QB2A8S-20P is a high-performance active balancing Battery Management System engineered for engine starting and cranking applications. Supporting lithium battery packs (Li-Ion, LiFePO4, LTO), it delivers an exceptional 2500A maximum starting current with 200A continuous charge/discharge capability — making it ideal for heavy-duty vehicles, marine engines, industrial equipment, and backup starting systems.
🔋 Why Choose Active Balance for Starting Applications?
Starting batteries demand instant, high-current delivery. Active balancing ensures all cells remain at equal voltage, maximizing the available peak current and extending battery pack lifespan — critical when a reliable cold-crank is non-negotiable.
⚡ Key Features
- 2500A max starting current — engineered for high-demand cranking loads
- 400A instantaneous current | 200A continuous charge & discharge
- Active balancing up to 2A — maintains cell consistency for reliable starts
- Compatible with Li-Ion, LiFePO4, and LTO chemistries
- Bluetooth + UART communication (standard)
- Wide operating temperature: -30°C to 70°C — reliable cold-weather starting
- Compact: 227 × 120 × 21.12 mm | 620g
🔌 Compatible Battery Configurations
| Battery Type | Supported Cell Strings |
|---|---|
| Ternary Lithium (Li-Ion / NMC) | 3–8S |
| Lithium Iron Phosphate (LiFePO4) | 3–8S |
| Lithium Titanate (LTO) | 7–8S |
📡 Model Variants (Communication Options)
| Model | Communication |
|---|---|
| JK-QB2A8S-20P | Standard (Bluetooth + UART) |
| JK-QB2A8S-20PC | Standard + CAN |
| JK-QB2A8S-20PR | Standard + RS485 |
| JK-QB2A8S-20PCR | Standard + CAN + RS485 |
⚙️ Basic Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 7.5–40 | V |
| Operating Power Consumption | 1000–1400 | mW |
| Operating Temperature | -30 to 70 | °C |
| Max Balancing Current | 2 | A |
| Max Charge Current | 200 | A |
| Max Discharge Current | 200 | A |
| Max Instantaneous Current | 400 | A |
| Max Starting Current | 2500 | A |
| Max Internal Loop Resistance | 0.3 | mΩ |
| Dimensions | 227 × 120 × 21.12 | mm |
| Weight | 620 | g |
🔒 Protection Parameters
| Protection | Li-Ion | LiFePO4 | LTO | Unit |
|---|---|---|---|---|
| Overcharge Voltage | 4.2 | 3.6 | 2.7 | V |
| Undervoltage Protection | 2.82 | 2.6 | 1.8 | V |
| Charging OTP | 70 | 70 | 70 | °C |
| Discharge OTP | 70 | 70 | 70 | °C |
| MOS OTP | 100 | 100 | 100 | °C |
| Short Circuit Protection Delay | 5 | 5 | 5 | μS |
Manufactured by Chengdu Jikong Technology Co., LTD. Sold and supported by JKBMS.
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