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JK BMS BD4A17S4P active balance BMS

Model: JK-BD4A17S4P · SKU: JK-BD4A17S4P

Prepared Nov 12, 2026

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Common specifications

Series cells	8-17S (LiFePO4), 7-17S (ternary lithium), 14-17S (LTO)Source [1, 2]
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 10A (not a stated wattage)Source [1]
Weight	0.21 kg0.45 lb convertedCalculatedSource [1]
Dimensions	116 D × 103 D × 17.6 D mm4.57 D × 4.06 D × 0.69 D in convertedSource [1]
Enclosure volume	0.21 L** Calculated from recorded external dimensions
Warranty term	Not documented

All recorded specifications

Balance current	0.4 ADocumented claim Conditions Printed as "最大均衡电流 (Maximum balancing current) 0.4 A" in the series' basic parameter table; the store page prints "Balance Current 0.4A". Location: Basic parameter table, section 4.1, PDF page 18 Printed as "最大均衡电流 (Maximum balancing current) 0.4 A" in the series' basic parameter table; the store page prints "Balance Current 0.4A". Location: Basic parameter table, section 4.1, PDF page 18 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 Official product page · Jikong Technology Official Store: JKBMS JK-BD4A17S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2]
Balancing	Active balancingDocumented claim Conditions Printed on the cover of the series specification as "Lithium battery active balancing protection board". Location: Cover Printed on the cover of the series specification as "Lithium battery active balancing protection board". Location: Cover Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Battery chemistry	Ternary lithium (Li-ion), LiFePO4, LTODocumented claim Conditions 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)" for the JK-BD4A17S-4P. Location: Product adaptation guide, section 2.2, PDF page 9, JK-BD4A17S-4P row 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)" for the JK-BD4A17S-4P. Location: Product adaptation guide, section 2.2, PDF page 9, JK-BD4A17S-4P row Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Communications	Bluetooth (standard), UART and display interface (standard); CAN and RS485 optionalDocumented claim Conditions 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, RS485". 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, RS485". Location: Product function configuration table, section 2.1, PDF page 8; store page additional information table Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 Official product page · Jikong Technology Official Store: JKBMS JK-BD4A17S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2]
Continuous charge current	40 ADocumented claim Conditions Printed as "最大充电电流 (Maximum charging current) 40 A" in the series' basic parameter table. Location: Basic parameter table, section 4.1, PDF page 18 Printed as "最大充电电流 (Maximum charging current) 40 A" in the series' basic parameter table. Location: Basic parameter table, section 4.1, PDF page 18 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Continuous discharge current	40 ADocumented claim Conditions Printed as "最大放电电流 (Maximum discharge current) 40 A" in the series' basic parameter table; the store page prints "Continuous Discharge 40A". No duration is printed. Location: Basic parameter table, section 4.1, PDF page 18 Printed as "最大放电电流 (Maximum discharge current) 40 A" in the series' basic parameter table; the store page prints "Continuous Discharge 40A". No duration is printed. Location: Basic parameter table, section 4.1, PDF page 18 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 Official product page · Jikong Technology Official Store: JKBMS JK-BD4A17S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2]
Dimensions	116 D × 103 D × 17.6 D mm4.57 D × 4.06 D × 0.69 D in convertedDocumented claim Conditions Printed as "保护板尺寸 (Protective plate size) 11610317.6 mm" in the basic parameter table and as 116mm×103mm×17.6mm in section 5.3; the figures are not labeled by axis, so they are stored in the order printed. Section 5.3 gives this as the size of the JK-BD4A24S-4P series board. Location: Basic parameter table, PDF page 18; section 5.3, PDF page 25 Printed as "保护板尺寸 (Protective plate size) 11610317.6 mm" in the basic parameter table and as 116mm×103mm×17.6mm in section 5.3; the figures are not labeled by axis, so they are stored in the order printed. Section 5.3 gives this as the size of the JK-BD4A24S-4P series board. Location: Basic parameter table, PDF page 18; section 5.3, PDF page 25 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Heating output	Heating function optional, designed heating current 10A (not a stated wattage)Documented claim Conditions Printed as "加热功能 (Heating function) 选配 (Optional)" in the function configuration table and "designed heating current is 10A" 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 10A" in section 3.3. Location: Product function configuration table, section 2.1; section 3.3, Heating function Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Operating temperature	-30 to 70 °C-22 to 158 °F convertedDocumented claim Conditions Printed as "工作温度 (Operating temperature) -30-70 ℃" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 18 Printed as "工作温度 (Operating temperature) -30-70 ℃" in the basic parameter table. Location: Basic parameter table, section 4.1, PDF page 18 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]
Series cells	8-17S (LiFePO4), 7-17S (ternary lithium), 14-17S (LTO)Documented claim Conditions Printed in the specification's adaptation guide for the JK-BD4A17S-4P as 7～17 strings for ternary lithium, 8～17 for lithium iron and 14～17 for lithium titanate batteries; the store page prints "Series 8-17S". Location: Product adaptation guide, section 2.2, PDF page 9, JK-BD4A17S-4P row; store page additional information table Printed in the specification's adaptation guide for the JK-BD4A17S-4P as 7～17 strings for ternary lithium, 8～17 for lithium iron and 14～17 for lithium titanate batteries; the store page prints "Series 8-17S". Location: Product adaptation guide, section 2.2, PDF page 9, JK-BD4A17S-4P row; store page additional information table Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 Official product page · Jikong Technology Official Store: JKBMS JK-BD4A17S4P Smart Active Balance BMS (October 21, 2026 capture) [1, 2]
Weight	0.21 kg0.45 lb convertedCalculated205 g / 1000 g per kg = 0.205 kg Conditions Printed as "成品重量 (Finished weight) 205 g" in the basic parameter table. The table covers the series. Location: Basic parameter table, section 4.1, PDF page 18 Printed as "成品重量 (Finished weight) 205 g" in the basic parameter table. The table covers the series. Location: Basic parameter table, section 4.1, PDF page 18 Official datasheet · JK-BD4A24S-4P Product specification, Version 19.0.1 [1]

Warranty

Certificate records

No records documented.

Sources and revisions

JK-BD4A24S-4P Product specification, Version 19.0.1Official datasheet · Revision 19.0.1 · Checked Oct 21, 2026https://www.jkbms.com/wp-content/uploads/2026/02/JK-BD4A24S-4P-Product-specification.pdf
Jikong Technology Official Store: JKBMS JK-BD4A17S4P Smart Active Balance BMS (October 21, 2026 capture)Official product page · Checked Oct 21, 2026https://www.shop.jkbms.com/product/jk-bd4a17s4p-smart-bms-17s-40a-0-4a-active-balancer/