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JK BMS QB2A8S20P vehicle starting active balance BMS

Model: JK-QB2A8S20P · SKU: JK-QB2A8S20P

Prepared Nov 12, 2026

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Common specifications

Series cells	3-8S (LiFePO4 and ternary lithium), 7-8S (LTO)Needs confirmationSource See note below[1]
Battery chemistry	Ternary lithium (Li-ion), LiFePO4, LTOSource [1]
Continuous discharge current	200 ASource [1, 2]
Continuous charge current	200 ASource [1]
Balance current	2 ASource [1, 2]
Communications	Bluetooth (standard), GPS interface (standard), display interface (standard); RS485 and CAN optionalSource [1]
Peak discharge current	Not documented
Balancing	Active balancingSource [1]
Heating output	Heating function standard, designed heating current 20A (not a stated wattage)Source [1]
Weight	0.62 kg1.4 lb convertedCalculatedSource [1]
Dimensions	227 D × 120 D × 21.12 D mm8.94 D × 4.72 D × 0.83 D in convertedSource [1]
Enclosure volume	0.58 L** Calculated from recorded external dimensions
Warranty term	Not documented

All recorded specifications

Balance current	2 ADocumented claim Conditions Printed as "最大均衡电流 (Maximum balancing current) 2 A" in the basic parameter table; the store page prints "Balance Current 2A". Location: Basic parameter table, section 4.1, PDF page 17 Printed as "最大均衡电流 (Maximum balancing current) 2 A" in the basic parameter table; the store page prints "Balance Current 2A". Location: Basic parameter table, section 4.1, PDF page 17 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 Official product page · Jikong Technology Official Store: JKBMS JK-QB2A8S20P Parking Start Dedicated BMS [1, 2]
Balancing	Active balancingDocumented claim Conditions Printed 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 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [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)". 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 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
Communications	Bluetooth (standard), GPS interface (standard), display interface (standard); RS485 and CAN optionalDocumented claim Conditions Printed in the function configuration table as "蓝牙功能 (Bluetooth function) 标配 (Standard option)", "GPS接口 (GPS interface) 标配", "RS485 选配 (Optional)", "CAN 选配 (Optional)" and "显示屏接口 (Display interface) 标配". Location: Product function configuration table, section 2.1, PDF page 8 Printed in the function configuration table as "蓝牙功能 (Bluetooth function) 标配 (Standard option)", "GPS接口 (GPS interface) 标配", "RS485 选配 (Optional)", "CAN 选配 (Optional)" and "显示屏接口 (Display interface) 标配". Location: Product function configuration table, section 2.1, PDF page 8 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
Continuous charge current	200 ADocumented claim Conditions Printed as "最大充电电流 (Maximum charging current) 200 A" in the basic parameter table; section 3.17 adds a charge current limiting function that holds the charging current at about 10A after a charge overcurrent. Location: Basic parameter table, section 4.1, PDF page 17 Printed as "最大充电电流 (Maximum charging current) 200 A" in the basic parameter table; section 3.17 adds a charge current limiting function that holds the charging current at about 10A after a charge overcurrent. Location: Basic parameter table, section 4.1, PDF page 17 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
Continuous discharge current	200 ADocumented claim Conditions Printed as "最大放电电流 (Maximum discharge current) 200 A" in the basic parameter table; the store page prints "Continuous Discharge 200A". 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) 200 A" in the basic parameter table; the store page prints "Continuous Discharge 200A". No duration is printed. Location: Basic parameter table, section 4.1, PDF page 17 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 Official product page · Jikong Technology Official Store: JKBMS JK-QB2A8S20P Parking Start Dedicated BMS [1, 2]
Dimensions	227 D × 120 D × 21.12 D mm8.94 D × 4.72 D × 0.83 D in convertedDocumented claim Conditions Printed as "保护板尺寸 (Protective plate size) 22712021.12 mm" in the basic parameter table and as 227mm×120mm×21.12mm in section 5.2; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 17; section 5.2, PDF page 24 Printed as "保护板尺寸 (Protective plate size) 22712021.12 mm" in the basic parameter table and as 227mm×120mm×21.12mm in section 5.2; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 17; section 5.2, PDF page 24 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
Heating output	Heating function standard, designed heating current 20A (not a stated wattage)Documented claim Conditions Printed as "The protection board is equipped with heating function as standard" and "The designed heating current is 20A."; a forced heating switch is added for low-temperature charging. Location: Section 3.3, Heating function Printed as "The protection board is equipped with heating function as standard" and "The designed heating current is 20A."; a forced heating switch is added for low-temperature charging. Location: Section 3.3, Heating function Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
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. Conditions Printed in the product adaptation guide 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 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 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]
Weight	0.62 kg1.4 lb convertedCalculated620 g / 1000 g per kg = 0.62 kg Conditions Printed as "成品重量 (Finished weight) 620 g" in the basic parameter table. Location: Basic parameter table, PDF page 17 Printed as "成品重量 (Finished weight) 620 g" in the basic parameter table. Location: Basic parameter table, PDF page 17 Official datasheet · JK-QB2A8S-20P Product specification, Version 19.2.1 [1]

Warranty

Certificate records

No records documented.

Sources and revisions

JK-QB2A8S-20P Product specification, Version 19.2.1Official datasheet · Revision 19.2.1 · Checked Oct 13, 2026https://www.jkbms.com/wp-content/uploads/2026/02/JK-QB2A8S-20P-Product-specification.pdf
Jikong Technology Official Store: JKBMS JK-QB2A8S20P Parking Start Dedicated BMSOfficial product page · Checked Oct 13, 2026https://www.shop.jkbms.com/product/jk-qb2a8s20p-smart-bms-200a-2a-active-balancer-vehicle-start/