Battery compatibility
Chemistry changes the series range
- Li-ion (ternary/NMC)
- 3–8S
- LiFePO4 (LFP)
- 3–8S
- Lithium titanate (LTO)
- 7–8S
1 / 6JKBMS JK-B1A / B2A Series
JKBMS JK-B2A8S20P Smart Active Balance BMS
3-8S 200 A smart BMS with 2 A active balancing and suffix-based communication
JK-B2A8S20P supports 3-8S Li-ion or LiFePO4 and 7-8S LTO packs. The V22.1.1 manual lists 200 A maximum charge/discharge current, 400 A instantaneous current and 2 A active balancing. Bluetooth, UART and display are standard; CAN, RS485 and heating require the corresponding suffix. Confirm V19 versus V22 before choosing dimensions or a harness.
- Model
- JK-B2A8S20P
- Battery fit
- Li-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S
- Current
- 200 A max discharge
- Active balance
- 2 A
- Manual basis
- V22.1.1 / V19.2.1
Choose configuration
Selected configuration$124.96
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MANUAL-VERIFIED TECHNICAL REFERENCE
JK-B2A8S20P data by hardware revision
V22.1.1 verifies 3-8S Li-ion/LiFePO4, 7-8S LTO, 200 A maximum charge/discharge current and 2 A active balancing. V19.2.1 has different dimensions, weight, interfaces and wiring, so both revisions are shown separately.
Electrical limits
Use the correct rating label
- Active balance
- 2 A
- Maximum charge
- 200 A
- Maximum discharge
- 200 A
- Instantaneous current
- 400 A
- Supply voltage
- 7.5–36 V
- Cell-voltage accuracy
- ±3 mV
Manual maximum values are not a substitute for cable, terminal, fuse and thermal design.
Interfaces and functions
Standard is not the same as optional
Standard
Bluetooth · UART · display interface
Optional / suffix-dependent
CAN · RS485 · heating control
- CAN, RS485 and heating are suffix-dependent; they are not universal features of the base SKU.
- V19 and V22 connector layouts and harness definitions must be checked separately.
Mechanical and environment
Match dimensions to the label
- V22.1.1
- 160 × 80.78 × 15.1 mm · 358 g
- V19.2.1
- 152.25 × 127.26 × 15.6 mm · 424 g
- Operating temperature
- -30°C to 70°C
- Maximum operating power
- 1.3 W
Configuration suffix guide
Order the interface you actually need
- Base
- Standard configuration
- C
- CAN
- R
- RS485
- CR
- CAN + RS485
- H
- Heating
- HC
- Heating + CAN
- HR
- Heating + RS485
- HCR
- Heating + CAN + RS485
Revision control matters.
- The available documents do not establish that V22 replaces every V19 unit.
- Do not select a communication harness from connector appearance alone.
- The 7.5-36 V supply, up to 1.3 W operating power and V22 mechanical data apply to V22.1.1.
Manual basis
Documents reviewed for this page
- JK-B2A8S-20P User Manual V22.1.1Reviewed pages: 8-9, 16, 20-23
- JK-B2A8S-20P User Manual V19.2.1Reviewed pages: 8-9, 16, 20-23
Before ordering
Four details that prevent the wrong configuration
- Confirm Li-ion, LiFePO4 or LTO chemistry and the exact series count.
- Confirm the V19 or V22 hardware/manual revision from the product label.
- Select the required suffix for CAN, RS485 and/or heating; do not assume these are on the base SKU.
- Check cable size, terminals, fuse, enclosure cooling and expected charge/discharge duty.
Product details
Supply scope and specifications
Key features
- Chemistry-specific support: 3-8S Li-ion/LiFePO4 and 7-8S LTO
- V22 maximum charge/discharge current: 200 A; instantaneous current: 400 A
- 2 A active cell balancing and ±3 mV cell-voltage accuracy
- Base V22 interfaces: Bluetooth, UART and display
- Suffix options: CAN, RS485 and heating in C/R/H combinations
- Revision-controlled dimensions and wiring for V19.2.1 versus V22.1.1
Included
- Selected JKBMS smart BMS model or display bundle
- Model-specific wiring harness and standard accessories supplied with the product
- Documentation or setup references supplied with the selected package
Not included
- Battery cells, battery enclosure, inverter, charger, and external power cabling
- External contactors, breakers, fuses, and installation hardware unless specified
- Onsite installation, commissioning, firmware setup, or inverter configuration service
ModelJK-B2A8S20P
SeriesJKBMS JK-B1A / B2A Series
Battery ChemistryLi-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S
Series RatingLi-ion 3–8S; LiFePO4 3–8S; Lithium titanate 7–8S
Balance Current2 A active
Maximum Charge Current200 A
Maximum Discharge Current200 A
Instantaneous Current400 A
Supply Voltage7.5–36 V
Operating Temperature-30°C to 70°C
Cell-voltage Accuracy±3 mV
Maximum Operating Power1.3 W
Standard CommunicationBluetooth, UART, display interface
Optional CommunicationCAN, RS485, heating control
DimensionsV22.1.1: 160 × 80.78 × 15.1 mm; V19.2.1: 152.25 × 127.26 × 15.6 mm
WeightV22.1.1: 358 g; V19.2.1: 424 g
Manual RevisionV22.1.1 / V19.2.1
Detailed product information
Complete visual product guide
Review the full product illustrations, dimensions, component information, and application notes before selecting a configuration.
SELECTION HELP
Check the system requirements before ordering
SELECTION GUIDE
How to choose a JKBMS
Check strings, current, active balancing, display, and communication requirements before comparing models.
Read guideBALANCING GUIDE1A vs 2A active balancing
Understand how balance-current class relates to cell capacity, imbalance, and correction time.
Read guideCOMMUNICATION GUIDECAN vs RS485 for a BMS
Separate physical interface choice from inverter protocol and system compatibility requirements.
Read guideMODEL-SPECIFIC APPLICATION NOTES
JK-B2A8S20P selection context
JK-B2A8S20P should be compared as a specific JK-B2A series product, not only by a copied title or image. The selection should be based on the real battery system, installation space, communication needs, and official quotation or checkout configuration.Why this model matters
Choose the battery chemistry and ordered C/R/H suffix first, then match the product label to V19 or V22 before using any dimensions, connector definition or harness.
Application context
JKBMS JK-B2A8S20P Smart Active Balance BMS belongs to the JK-B2A series and is best reviewed for compact lithium packs where active balancing, current rating, and app monitoring are key selection inputs.
The listed battery string range is Li-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S. The current reference is 200 A. The active-balancing reference is 2 A active.
For communication planning, this page lists Standard: Bluetooth, UART, display interface; Optional: CAN, RS485, heating control; protocol, pinout, cable, firmware, and inverter or service-tool settings still need confirmation.
Decision checks
- Battery chemistry or cell fit: Li-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S.
- Mechanical planning: reserve space around V22.1.1: 160 × 80.78 × 15.1 mm; V19.2.1: 152.25 × 127.26 × 15.6 mm, cable exits, airflow, and service access.
- For direct checkout, verify the selected configuration and destination shipping before payment.
- Use www.jkbms.net and zhou@jkbms.net to verify official source, quotation, and bulk purchasing details.
Model planning
Model fit and purchase planning
Use this summary to confirm whether JKBMS JK-B2A8S20P Smart Active Balance BMS fits the battery system before checkout, quotation, or installation.
- Model
- JK-B2A8S20P
- Primary use
- Smart active-balance BMS for compact lithium packs
- Battery strings
- Li-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S
- Current reference
- 200 A
- Active balancing
- 2 A active
- Communication
- Standard: Bluetooth, UART, display interface; Optional: CAN, RS485, heating control
- Installation size
- V22.1.1: 160 × 80.78 × 15.1 mm; V19.2.1: 152.25 × 127.26 × 15.6 mm
Pre-order checks
- JKBMS JK-B2A8S20P Smart Active Balance BMS should be checked against the real battery pack, load current, installation space, thermal conditions, and selected accessories before purchase.
- The listed 200 A current reference must be matched with cable size, terminals, fuse or breaker, battery cells, thermal design, and expected inverter demand.
- The listed communication options are Standard: Bluetooth, UART, display interface; Optional: CAN, RS485, heating control; protocol, pinout, firmware, and inverter compatibility still need project-level confirmation.
- The 2 A active balancing specification is one selection factor and does not replace matched cells, correct wiring, or suitable charging settings.
System fit checks
Compatibility, installation, and official purchase checks
Use these checks before selecting a configuration, requesting a quote, or installing the product in a battery system.
Match the product to the battery system
Confirm the battery pack is within Li-ion (ternary/NMC) 3–8S; LiFePO4 (LFP) 3–8S; Lithium titanate (LTO) 7–8S. Match the 200 A current reference to the inverter, load, wiring, protection, and thermal design. Use the 2 A active active-balancing class as one selection input, not as a substitute for good cell matching.
Confirm protocol and interface details
Communication status: Standard: Bluetooth, UART, display interface; Optional: CAN, RS485, heating control. Confirm protocol, pinout, baud rate or CAN bitrate, firmware, and inverter compatibility before installation.
Plan wiring, mounting, and operating conditions
Reserve space for the listed dimensions: V22.1.1: 160 × 80.78 × 15.1 mm; V19.2.1: 152.25 × 127.26 × 15.6 mm. Plan the installation around -30°C to 70°C operating conditions. Use suitable fusing, cable size, torque, ventilation, insulation, and commissioning checks for the final battery system.
Verify the product and quote channel
Verify this product on https://www.jkbms.net/products/jkbms-jk-b2a8s20p-200a-smart-bms-2a-active-balancer-12v-24v, confirm the official domain is www.jkbms.net, and use zhou@jkbms.net for quotation checks before bulk payment or project procurement.
Product FAQ
JK-B2A8S20P manual, wiring and compatibility FAQ
Is JK-B2A8S20P a 3S-8S or 4S-8S BMS?
The V22.1.1 manual specifies 3-8S for ternary/NMC lithium and LiFePO4, and 7-8S for LTO. The previous generic 4-8S wording did not describe the chemistry-specific limits accurately.
Are CAN, RS485 and heating included on the base JK-B2A8S20P?
No. Bluetooth, UART and the display interface are standard on the V22 base configuration. CAN, RS485 and heating depend on the ordered C, R and H suffix combination.
What is the difference between JK-B2A8S20P V19 and V22?
The revisions use different enclosure sizes, weights, interfaces and wiring. V22 is 160 × 80.78 × 15.1 mm and 358 g; V19 is 152.25 × 127.26 × 15.6 mm and 424 g. Match the manual and harness to the label.
Can a V19 cable or harness be used on V22?
Do not assume compatibility. Verify the connector designation and pinout in the manual that matches the shipped hardware revision before wiring.
Is JKBMS JK-B2A8S20P Smart Active Balance BMS listed on the official JKBMS website?
JKBMS JK-B2A8S20P Smart Active Balance BMS is listed on www.jkbms.net, the official factory website operated by JKBMS Electronic Technology Co.,Ltd. Use https://www.jkbms.net and the official sales email zhou@jkbms.net to verify quotes before payment.
What is included with JKBMS JK-B2A8S20P Smart Active Balance BMS?
Selected JKBMS smart BMS model or display bundle; Model-specific wiring harness and standard accessories supplied with the product; Documentation or setup references supplied with the selected package. Not included: Battery cells, battery enclosure, inverter, charger, and external power cabling; External contactors, breakers, fuses, and installation hardware unless specified. The final selected configuration and written quotation remain the reference for supply scope.
How do payment, shipping, and returns work for JKBMS JK-B2A8S20P Smart Active Balance BMS?
Purchasable JKBMS products can be ordered from the product page. Verify the model, configuration, destination, and official sales contact before bulk purchasing or project use. Return and shipping rules are published at https://www.jkbms.net/policies.
Technical resources for this model
- JK-B2A8S20P manual and wiring diagramsOpen the document library by exact model code and confirm the manual revision before using a wiring diagram.
- JK-B2A8S20P version-specific CAN/RS485 pinout checksPin order and supported protocols can change by model and hardware revision. Use only a table that explicitly lists the exact version.
- Compare JK-B2A8S20P with nearby JKBMS modelsCompare documented battery range, current, balancing, communication and manual status in one table.
- JK-B2A8S20P JKBMS app setupUse the dedicated Android and iOS setup page, then match the app and connection method to the documented hardware revision.
Get in Touch
Ready to power your future? Contact us for a custom quote or partnership inquiry.
Phone+86 131 6282 8868
WhatsApp
WeChatEmailzhou@jkbms.net
LocationRoom 1008, Building B4, Yunzhi Science & Technology Park, Guangming District, Shenzhen, China