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JK BMS B2A8S20P active balance BMS

Model: JK-B2A8S20P · SKU: JK-B2A8S20P

Prepared Nov 12, 2026

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Common specifications

Series cells	3-8S (LiFePO4 and ternary lithium/Li-ion), 7-8S (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, UARTNeeds confirmationSource See note below[1]
Peak discharge current	400 ASource [1]
Balancing	Active balancingSource [1]
Heating output	Not documented
Weight	0.42 kg0.94 lb convertedCalculatedSource [3]
Dimensions	152.25 D × 127.26 D × 15.6 D mm5.99 D × 5.01 D × 0.61 D in convertedSource [3]
Enclosure volume	0.3 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-B2A8S20P 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-B2A8S20P Smart Active Balance BMS [1]
Battery chemistry	LiFePO4, Li-ion, LTODocumented claim Conditions Printed as "(LiFePO4, Li-ion, LTO)" on the page. Location: Product title or description Printed as "(LiFePO4, Li-ion, LTO)" on the page. Location: Product title or description Official product page · Jikong Technology Official Store: JKBMS JK-B2A8S20P Smart Active Balance BMS [1]
Communications	Bluetooth, UARTNeeds confirmationThe additional information table prints "Communication Bluetooth, UART", while the description prints "Communication: Bluetooth (Standard), support CANBus/RS485 customization.". The table's value is recorded first. Conditions Printed as "Communication Bluetooth, UART" in the additional information table. Location: Additional information table Printed as "Communication Bluetooth, UART" in the additional information table. Location: Additional information table Official product page · Jikong Technology Official Store: JKBMS JK-B2A8S20P 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 the basic parameter table; the same table prints "Maximum instantaneous current 400 A" separately and states no duration for the 200 A figure. Location: Basic parameter table, PDF page 16 Printed as "最大充电电流 (Maximum charging current) 200 A" in the basic parameter table; the same table prints "Maximum instantaneous current 400 A" separately and states no duration for the 200 A figure. Location: Basic parameter table, PDF page 16 Official datasheet · JK-BxA8S-20P Product specification, Version 19.2.1 [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-B2A8S20P Smart Active Balance BMS [1]
Dimensions	152.25 D × 127.26 D × 15.6 D mm5.99 D × 5.01 D × 0.61 D in convertedDocumented claim Conditions Printed as "保护板尺寸 (Protective plate size) 152.25127.2615.6 mm" in the basic parameter table; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 16 Printed as "保护板尺寸 (Protective plate size) 152.25127.2615.6 mm" in the basic parameter table; the figures are not labeled by axis, so they are stored in the order printed. Location: Basic parameter table, PDF page 16 Official datasheet · JK-BxA8S-20P Product specification, Version 19.2.1 [3]
Peak discharge current	400 ADocumented claim Conditions Printed as "Peak Discharge: 400A" in the description; no duration is printed. Location: Product description, technical specifications Printed as "Peak Discharge: 400A" in the description; no duration is printed. Location: Product description, technical specifications Official product page · Jikong Technology Official Store: JKBMS JK-B2A8S20P Smart Active Balance BMS [1]
Series cells	3-8S (LiFePO4 and ternary lithium/Li-ion), 7-8S (LTO)Needs confirmationJikong's specification prints the range by chemistry (3-8S (LiFePO4 and ternary lithium/Li-ion), 7-8S (LTO)), while its store page prints "Series 4-8S". The specification's range is recorded first. Conditions Printed in Jikong's specification's product adaptation guide as 3～8 strings for ternary lithium and for lithium iron (LiFePO4) batteries and 7～8 for lithium titanate (LTO) batteries. Revised on 13 October 2026: this field held "4-8S" 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 3～8 strings for ternary lithium and for lithium iron (LiFePO4) batteries and 7～8 for lithium titanate (LTO) batteries. Revised on 13 October 2026: this field held "4-8S" from Jikong's store page, which is kept as an alternative. Location: Product adaptation guide, section 2.2 (PDF page 9) Official datasheet · JK-BxA8S-20P Product specification, Version 19.2.1 [3]
Weight	0.42 kg0.94 lb convertedCalculated424 g / 1000 g per kg = 0.424 kg Conditions Printed as "成品重量 (Finished weight) 424 g" in the basic parameter table. One table covers the JK-B1A8S-20P and JK-B2A8S-20P. Location: Basic parameter table, PDF page 16 Printed as "成品重量 (Finished weight) 424 g" in the basic parameter table. One table covers the JK-B1A8S-20P and JK-B2A8S-20P. Location: Basic parameter table, PDF page 16 Official datasheet · JK-BxA8S-20P Product specification, Version 19.2.1 [3]

Warranty

Certificate records

No records documented.

Sources and revisions

Jikong Technology Official Store: JKBMS JK-B2A8S20P Smart Active Balance BMSOfficial product page · Checked Oct 3, 2026https://www.shop.jkbms.com/product/jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v/
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-BxA8S-20P Product specification, Version 19.2.1Official datasheet · Revision 19.2.1 · 2025-04-27 · Checked Oct 13, 2026https://www.jkbms.com/wp-content/uploads/2026/04/JK-BxA8S-20P-Product-specification.pdf