JKBMS
JKBMS JK-BD4A8S4P | 40A BMS for RV, Marine & Portable Power | 3S-8S LiFePO4 Li-ion | Bluetooth + Optional RS485/CAN
JKBMS JK-BD4A8S4P | 40A BMS for RV, Marine & Portable Power | 3S-8S LiFePO4 Li-ion | Bluetooth + Optional RS485/CAN
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Compact & Lightweight for Mobile Power — JKBMS JK-BD4A8S4P 40A Smart BMS for 3S–8S
The JK-BD4A8S4P is a compact 40A BMS for LiFePO4, Li-ion, and LTO battery packs — designed for RV auxiliary batteries, marine electronics, portable power stations, and light backup power applications where size and weight matter. Bluetooth monitoring is built in; RS485 and CAN are available as optional add-ons.
Compatible chemistries: LiFePO4 / Li-ion / LTO
Key Specifications
| Parameter | Specification |
|---|---|
| Model | JK-BD4A8S4P |
| Cell Configuration | 3S–8S (LiFePO4 / Li-ion) · 7S–8S (LTO) |
| Continuous Current | 40A |
| Active Balance Current | 0.4A |
| Standard Communication | Bluetooth + UART (LCD display port) |
| Optional Add-ons | RS485 / CAN |
| Compatible Chemistry | LiFePO4, Li-ion, LTO |
| Protection | Over-charge, Over-discharge, Over-current, Short-circuit, Over/Under-temperature |
Note: LTO (Lithium Titanate) cells require a minimum of 7S configuration.
Voltage Platform & Load Class — Where This BMS Fits
📊 3S–8S (LiFePO4 / Li-ion) — Light Load Applications
The 3S–8S platform covers RV auxiliary batteries, marine electronics, portable power stations, and light backup power systems. At 40A, this BMS is sized for light-load applications — powering lighting, small appliances, and electronics rather than high-draw inverters or motors.
🔋 7S–8S (LTO) — Lithium Titanate Configuration
For LTO chemistry, this BMS supports 7S–8S configurations, offering superior cycle life and low-temperature performance for demanding environments.
⚡ 0.4A Active Balancing — Cell Health for Light-Duty Packs
Active balancing continuously transfers energy between cells, keeping your pack balanced through every cycle — more usable capacity and longer pack life compared to passive alternatives.
Who Is This BMS For?
- 🛥 RV auxiliary battery systems (light load)
- ⛵ Marine electronics battery banks
- 🔦 Portable power stations and camping power
- 🔋 Light backup power systems
- 🏭 OEM manufacturers of compact 40A lithium battery packs
Custom Configuration Available
All JKBMS products support feature customization for OEM orders — including communication interfaces, protection thresholds, balance parameters, and hardware configuration. 📩 Contact us to discuss your custom requirements.
OEM / ODM & Bulk Orders
📩 For wholesale pricing, MOQ, and custom configurations, please contact us directly.
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