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JK BMS B2A20S20P active balance BMS

Model: JK-B2A20S20P · SKU: JK-B2A20S20P

Prepared Nov 12, 2026

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Common specifications

Series cells	8-20S (LiFePO4), 7-20S (ternary lithium/Li-ion), 14-20S (LTO)Needs confirmationSource See note below[3]
Battery chemistry	LiFePO4, Li-ion, LTOSource [1]
Continuous discharge current	200 ASource [1]
Continuous charge current	200 ASource [3]
Balance current	2 ASource [1]
Communications	Bluetooth, RS485Needs confirmationSource See note below[1]
Peak discharge current	400 ASource [1]
Balancing	Active balancingSource [1]
Heating output	Not documented
Weight	0.56 kg1.2 lb convertedCalculatedSource [3]
Dimensions	162 D × 102 D × 20.4 D mm6.38 D × 4.02 D × 0.8 D in convertedSource [3]
Enclosure volume	0.34 L** Calculated from recorded external dimensions
Warranty term	Not documented

All recorded specifications

Balance current	2 ADocumented claim Conditions Printed as "Balance Current 2A" in the additional information table; the description prints an active balancing range of "0.1A – 2.0A", so this is the maximum. Location: Additional information table Printed as "Balance Current 2A" in the additional information table; the description prints an active balancing range of "0.1A – 2.0A", so this is the maximum. Location: Additional information table Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Balancing	Active balancingDocumented claim Conditions Printed as "Smart Active Balance BMS" in the product title. Location: Product title Printed as "Smart Active Balance BMS" in the product title. Location: Product title Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Battery chemistry	LiFePO4, Li-ion, LTODocumented claim Conditions Printed as "LiFePO4, Li-ion, and LTO" on the page. Location: Product title or description Printed as "LiFePO4, Li-ion, and LTO" on the page. Location: Product title or description Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Communications	Bluetooth, RS485Needs confirmationThe additional information table prints "Communication Bluetooth, RS485", while the description prints "Communication: Integrated Bluetooth, support for RS485/CAN/GPS modules.". The table's value is recorded first. Conditions Printed as "Communication Bluetooth, RS485" in the additional information table. Location: Additional information table Printed as "Communication Bluetooth, RS485" in the additional information table. Location: Additional information table Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Continuous charge current	200 ADocumented claim Conditions Printed as "最大充电电流 (Maximum charging current) 200 A" in section 4.2, the 200A protection board basic parameter table; the same table prints "Maximum instantaneous current 400 A" separately and states no duration for the 200 A figure. Location: 200A protection board basic parameter table, PDF page 20 Printed as "最大充电电流 (Maximum charging current) 200 A" in section 4.2, the 200A protection board basic parameter table; the same table prints "Maximum instantaneous current 400 A" separately and states no duration for the 200 A figure. Location: 200A protection board basic parameter table, PDF page 20 Official datasheet · JK-BxAxxS-15P / JK-BxAxxS-20P Product specification, Version 19.1.1 [3]
Continuous discharge current	200 ADocumented claim Conditions Printed as "Continuous Discharge 200A" in the additional information table. Location: Additional information table Printed as "Continuous Discharge 200A" in the additional information table. Location: Additional information table Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Dimensions	162 D × 102 D × 20.4 D mm6.38 D × 4.02 D × 0.8 D in convertedDocumented claim Conditions Printed as "保护板尺寸 (Protective plate size) 16210220.4 mm" in the 200A board's basic parameter table; section 5.3 prints the same size for the whole JK-BxAxxS-15P/20P series. The figures are not labeled by axis, so they are stored in the order printed. Location: 200A protection board basic parameter table, PDF page 20 Printed as "保护板尺寸 (Protective plate size) 16210220.4 mm" in the 200A board's basic parameter table; section 5.3 prints the same size for the whole JK-BxAxxS-15P/20P series. The figures are not labeled by axis, so they are stored in the order printed. Location: 200A protection board basic parameter table, PDF page 20 Official datasheet · JK-BxAxxS-15P / JK-BxAxxS-20P Product specification, Version 19.1.1 [3]
Peak discharge current	400 ADocumented claim Conditions Printed as "Peak Discharge Current: 400A" in the description; no duration is printed. Location: Product description, technical specifications Printed as "Peak Discharge Current: 400A" in the description; no duration is printed. Location: Product description, technical specifications Official product page · Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMS [1]
Series cells	8-20S (LiFePO4), 7-20S (ternary lithium/Li-ion), 14-20S (LTO)Needs confirmationJikong's specification prints the range by chemistry (8-20S (LiFePO4), 7-20S (ternary lithium/Li-ion), 14-20S (LTO)), while its store page prints "Series 8-20S". The specification's range is recorded first. Conditions Printed in Jikong's specification's product adaptation guide as 7～20 strings for ternary lithium, 8～20 for lithium iron (LiFePO4) and 14～20 for lithium titanate (LTO) batteries, for the JK-BxA20S-15P/20P boards. Revised on 13 October 2026: this field held "8-20S" from Jikong's store page, which is kept as an alternative. Location: Product adaptation guide, section 2.2 (PDF page 9) Printed in Jikong's specification's product adaptation guide as 7～20 strings for ternary lithium, 8～20 for lithium iron (LiFePO4) and 14～20 for lithium titanate (LTO) batteries, for the JK-BxA20S-15P/20P boards. Revised on 13 October 2026: this field held "8-20S" from Jikong's store page, which is kept as an alternative. Location: Product adaptation guide, section 2.2 (PDF page 9) Official datasheet · JK-BxAxxS-15P / JK-BxAxxS-20P Product specification, Version 19.1.1 [3]
Weight	0.56 kg1.2 lb convertedCalculated560 g / 1000 g per kg = 0.56 kg Conditions Printed as "成品重量 (Finished weight) 560 g" in the 200A board's basic parameter table. Location: 200A protection board basic parameter table, PDF page 20 Printed as "成品重量 (Finished weight) 560 g" in the 200A board's basic parameter table. Location: 200A protection board basic parameter table, PDF page 20 Official datasheet · JK-BxAxxS-15P / JK-BxAxxS-20P Product specification, Version 19.1.1 [3]

Warranty

Certificate records

No records documented.

Sources and revisions

Jikong Technology Official Store: JKBMS JK-B2A20S20P Smart Active Balance BMSOfficial product page · Checked Oct 3, 2026https://www.shop.jkbms.com/product/jk-b2a20s20p-smart-bms-200a-20s-active-balancer/
CNEEL Battery Official Store product page: JK BMS 1A 2A Active Balance Lifepo4 BMS 8S 16S 24S 100A 150A 200A 500A Smart Protection Board with BluetoothPaid link.Distributor product page · Checked Oct 3, 2026https://www.cneelbattery.com/products/jk-bms-1a-2a-active-balance-lifepo4-bms-8s-16s-24s-100a-150a-200a-500a-smart-protection-board-with-bluetooth
JK-BxAxxS-15P / JK-BxAxxS-20P Product specification, Version 19.1.1Official datasheet · Revision 19.1.1 · 2025-02-08 · Checked Oct 13, 2026https://www.jkbms.com/wp-content/uploads/2026/02/JK-BxAxxS-15P-JK-BxAxxS-20P-Product-specification.pdf