JKBMS Active Balancer JK-B2A8S — 2A 2~8S Battery Equalizer

JKBMS JK-B2A8S — 2A Active Battery Balancer for 2~8S Packs

The JK-B2A8S is a compact, high-precision active battery balancer designed for 2 to 8 series battery packs. Using ultracapacitor-based energy transfer technology, it delivers a constant 2A balancing current regardless of the voltage difference between cells — eliminating the energy waste of passive balancing and extending the life of your battery pack.

Key Features

• 2A constant active balancing current — independent of cell voltage delta
• High-precision voltage monitoring — ±3mV accuracy per cell
• Supports 2~8S configurations — LiFePO4, Li-ion, LiPo, LTO, lead-acid
• Bluetooth connectivity — monitor cell voltages, balancing status, and adjust parameters via mobile app
• Optional RS485 or CAN communication (one of two, select at order)
• Optional temperature sensor input
• LED Bluetooth status indicator
• Compact and lightweight — 136.6 × 85.3 × 20.5 mm, 450g
• No power-on switch — connects and starts balancing automatically

Technical Specifications

• Cell count: 2S ~ 8S
• Balancing current: 2A (constant)
• Cell voltage range: 1V ~ 5V
• Voltage accuracy: ±3mV
• External power supply: DC 10~40V (via V+ / V- terminals)
• Dimensions: 136.6 × 85.3 × 20.5 mm
• Weight: 450g
• Communication: Bluetooth (standard) + optional RS485 or CAN

Interface

• P1 — Balance & cell voltage connector (XH-11AW): B0~B8 cell taps + V+/V− power
• P2 — Temperature sensor input (XH-2AW, optional)
• P3 — RS485 / CAN communication port (XH-3AW, optional)
• D1 — LED Bluetooth status indicator

Typical Applications

• Small sightseeing vehicles and e-scooters
• Home energy storage systems (ESS)
• Solar power stations and off-grid systems
• Base station backup power
• Battery pack maintenance and cell recovery

Wiring Notes

• Verify all balance wire connections before powering on
• When used alongside a BMS protection board, connect V− to the BMS P− terminal
• No power-on switch — the balancer starts working immediately upon connection

📱 Bluetooth App: Available for iOS and Android — monitor cell voltages, balancing status, and configure parameters wirelessly.

📦 In Stock — Ships from US Warehouse (fast local delivery)

Need help? Contact us via WhatsApp: +1 818 938 3175 | Email: service@jkbms-ess.com