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JK BMS BD4A8S4P active balance BMS
Model: JK-BD4A8S4P · SKU: JK-BD4A8S4P
Prepared Nov 12, 2026
Common specifications
| Series cells | |
|---|---|
| Battery chemistry | Ternary lithium (Li-ion), LiFePO4, LTOSource [1] |
| Continuous discharge current | 40 ASource [1, 2] |
| Continuous charge current | 40 ASource [1] |
| Balance current | 0.4 ASource [1, 2] |
| Communications | Bluetooth (standard), UART and display interface (standard); CAN and RS485 optionalSource [1, 2] |
| Peak discharge current | Not documented |
| Balancing | Active balancingSource [1] |
| Heating output | Heating function optional, designed heating current 4A (not a stated wattage)Source [1] |
| Weight | |
| Dimensions | |
| Enclosure volume | 0.2 L** Calculated from recorded external dimensions |
| Warranty term | Not documented |
All recorded specifications
| Balance current | 0.4 ADocumented claim ConditionsPrinted as "最大均衡电流 (Maximum balancing current) 0.4 A" in the 40 A board's basic parameter table; the store page prints "Balance Current 0.4A". Location: Basic parameter table, section 4.1, PDF page 17 Printed as "最大均衡电流 (Maximum balancing current) 0.4 A" in the 40 A board's basic parameter table; the store page prints "Balance Current 0.4A". Location: Basic parameter table, section 4.1, PDF page 17 Official datasheet · JK-BD4A8S-4P / JK-BD4A8S-6P Product specification, Version 15.3.2Official product page · Jikong Technology Official Store: JKBMS JK-BD4A8S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2] |
|---|---|
| Balancing | Active balancingDocumented claim ConditionsPrinted on the cover as "Lithium battery active balancing protection board". Location: Cover Printed on the cover as "Lithium battery active balancing protection board". Location: Cover |
| Battery chemistry | Ternary lithium (Li-ion), LiFePO4, LTODocumented claim ConditionsPrinted in the adaptation guide as "三元锂电池 (Ternary lithium battery)", "铁锂电池 (Lithium iron battery)" and "钛酸锂电池 (Lithium titanate battery)". Location: Product adaptation guide, section 2.2, PDF page 9 Printed in the adaptation guide as "三元锂电池 (Ternary lithium battery)", "铁锂电池 (Lithium iron battery)" and "钛酸锂电池 (Lithium titanate battery)". Location: Product adaptation guide, section 2.2, PDF page 9 |
| Communications | Bluetooth (standard), UART and display interface (standard); CAN and RS485 optionalDocumented claim ConditionsPrinted in the function configuration table as "蓝牙功能 (Bluetooth function) 标配 (Standard option)", "UART接口 (UART interface) 标配", "CAN 选配 (Optional)", "RS485 选配 (Optional)" and "显示屏接口 (Display interface) 标配". The store page prints "Communication Bluetooth, Display". Location: Product function configuration table, section 2.1, PDF page 8; store page additional information table Printed in the function configuration table as "蓝牙功能 (Bluetooth function) 标配 (Standard option)", "UART接口 (UART interface) 标配", "CAN 选配 (Optional)", "RS485 选配 (Optional)" and "显示屏接口 (Display interface) 标配". The store page prints "Communication Bluetooth, Display". Location: Product function configuration table, section 2.1, PDF page 8; store page additional information table Official datasheet · JK-BD4A8S-4P / JK-BD4A8S-6P Product specification, Version 15.3.2Official product page · Jikong Technology Official Store: JKBMS JK-BD4A8S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2] |
| Continuous charge current | 40 ADocumented claim ConditionsPrinted as "最大充电电流 (Maximum charging current) 40 A" in the 40 A board's basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 Printed as "最大充电电流 (Maximum charging current) 40 A" in the 40 A board's basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 |
| Continuous discharge current | 40 ADocumented claim ConditionsPrinted as "最大放电电流 (Maximum discharge current) 40 A" in the 40 A board's basic parameter table; the store page prints "Continuous Discharge 40A". No duration is printed. Location: Basic parameter table, section 4.1, PDF page 17 Printed as "最大放电电流 (Maximum discharge current) 40 A" in the 40 A board's basic parameter table; the store page prints "Continuous Discharge 40A". No duration is printed. Location: Basic parameter table, section 4.1, PDF page 17 Official datasheet · JK-BD4A8S-4P / JK-BD4A8S-6P Product specification, Version 15.3.2Official product page · Jikong Technology Official Store: JKBMS JK-BD4A8S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2] |
| Dimensions | 121.5 D × 93 D × 17.6 D mm4.78 D × 3.7 D × 0.69 D in convertedDocumented claim ConditionsPrinted as "保护板尺寸 (Protective plate size) 121.5*93*17.6 mm" in the basic parameter table and as 121.5mm×93mm×17.6mm in section 5.3; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 17; section 5.3, PDF page 25 Printed as "保护板尺寸 (Protective plate size) 121.5*93*17.6 mm" in the basic parameter table and as 121.5mm×93mm×17.6mm in section 5.3; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 17; section 5.3, PDF page 25 |
| Heating output | Heating function optional, designed heating current 4A (not a stated wattage)Documented claim ConditionsPrinted as "加热功能 (Heating function) 选配 (Optional)" in the function configuration table and "designed heating current is 4A" in section 3.3. Location: Product function configuration table, section 2.1; section 3.3, Heating function Printed as "加热功能 (Heating function) 选配 (Optional)" in the function configuration table and "designed heating current is 4A" in section 3.3. Location: Product function configuration table, section 2.1; section 3.3, Heating function |
| Operating temperature | -30 to 70 °C-22 to 158 °F convertedDocumented claim ConditionsPrinted as "工作温度 (Operating temperature) -30-70 ℃" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 Printed as "工作温度 (Operating temperature) -30-70 ℃" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 |
| Series cells | 3-8S (LiFePO4 and ternary lithium), 7-8S (LTO)Needs confirmationThe specification's adaptation guide prints 3-8 strings (7-8 for LTO), while the store page prints "Series 4-8S". The specification's range is recorded first. ConditionsPrinted in the product adaptation guide for the JK-BD4A8S-4P/6P as 3～8 strings for ternary lithium and lithium iron batteries and 7～8 for lithium titanate batteries. Location: Product adaptation guide, section 2.2, PDF page 9 Printed in the product adaptation guide for the JK-BD4A8S-4P/6P as 3～8 strings for ternary lithium and lithium iron batteries and 7～8 for lithium titanate batteries. Location: Product adaptation guide, section 2.2, PDF page 9 |
| Weight | 0.18 kg0.4 lb convertedCalculated180 g / 1000 g per kg = 0.18 kg ConditionsPrinted as "成品重量 (Finished weight) 180 g" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 Printed as "成品重量 (Finished weight) 180 g" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 17 |
Warranty
Certificate records
No records documented.
Sources and revisions
- JK-BD4A8S-4P / JK-BD4A8S-6P Product specification, Version 15.3.2Official datasheet · Revision 15.3.2 · Checked https://www.jkbms.com/wp-content/uploads/2026/02/JK-BD4A8S-4P-JK-BD4A8S-6P-Product-specification.pdf
- Jikong Technology Official Store: JKBMS JK-BD4A8S4P Smart Active Balance BMS (October 21, 2026 capture)Official product page · Checked https://www.shop.jkbms.com/product/jk-bd4a8s4p-smart-bms-4s-8s-40a-active-balancer/