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  • EF-004 12S–18S 250A Inspection Drone BMS | AYAATECH
  • EF-004 12S–18S 250A Inspection Drone BMS | AYAATECH

EF-004 12S–18S 250A Inspection Drone BMS | AYAATECH

  • Model Series:EF-004
  • Battery Type:Li-ion,Lithium polymer
  • Series (S):12S–18S
  • Rated Voltage:12.8V-32V
  • Active Balance:/
  • Continuous Discharge Current:250A
  • Communication Protocols:UART / Drone UAV CAN / RS485
  • Size:L160 * W90 * T16 mm
  • Application Fields:Plant-Protection Drones, Cargo-Lifting UAVs, Rescue Drones, Firefighting drones, Logistics & Delivery Drones
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Parameter information Product Detail

EF-004
12S-18S 250A Intelligent Drone BMS for
Inspection and Monitoring UAVs

Integration can be configured for DroneCAN, isolated CAN, isolated RS485 (Modbus), UART and charger communication. Final protocol matching is verified during engineering review.

Built for inspection and monitoring
drone platforms

Suitable for aerial imaging, crop observation, mapping, pipeline patrols, wildfire monitoring, environmental surveys, infrastructure checks and construction progress tracking.

EF-004 12S-18S 250A intelligent UAV BMS for inspection and monitoring drones
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EF-004
EF-004 12S-18S 250A configurable drone BMS for inspection and monitoring packs

Product Overview

EF-004 is a configurable intelligent BMS developed for UAV battery packs used in inspection, monitoring and survey missions.

It works with 12S-18S LiPo and semi-solid-state battery configurations, and can be equipped with isolated CAN, RS485 and DroneCAN communication. Dual-pack parallel operation can also be configured for UAV platforms that need longer endurance and dependable high-current output.

Protection limits, communication settings and interface choices can be adjusted around the battery pack, flight controller and charger design.

Protocol integration is available for selected PX4, DroneCAN, SkyRC CAN and project-specific UAV platforms. Compatibility is confirmed during the engineering evaluation stage.

Final compatibility is verified during the engineering evaluation stage.

Core Specifications

Cell series range12S-18SIsolated RS485 portStandard
Continuous discharge rating250AType-C communicationStandard
Continuous charging current120AIsolated CAN portStandard
NTC temperature inputs4 ch + 1 MOSBattery heating control
Passive cell balancingBluetooth module
External switch inputParallel-pack operation
Charge current limitConfigurableLCD display optionOptional
Secondary protection layerLED status indicator
Pre-discharge functionRTC function
EF-004 UAV BMS board with isolated CAN and RS485 communication interfaces
EF-004 | 12S-18S 250A INTELLIGENT UAV BMS

Engineering Support Capabilities

Host Communication Testing

High-Current UAV Power Loads

Configured for UAV battery packs that face demanding discharge profiles. Continuous and peak-current ratings are defined by the selected hardware configuration.

Configurable Protection Strategy

Adjustable Protection Logic

Monitoring and protection limits can be set for cell voltage, pack current and temperature conditions.

EF-004 UAV BMS host communication testing for CAN RS485 and DroneCAN integration

Protocol and Interface Integration

Supports isolated CAN, isolated RS485 and DroneCAN integration, with project-specific protocol setup available.

Custom UAV BMS engineering and firmware configuration support

OEM / ODM Development Support

Customization support covers series configuration, interfaces, firmware parameters, charger communication and battery-pack integration.

Technical FAQ and Field Checks

Q: What should I do if there is smoke or a burning odor when the voltage-sensing harness is connected?
Unplug the harness at once. Confirm the cell wiring follows the correct B0-B1-B2 sequence without skipped points or cold solder joints. For multi-interface BMS boards, connect the low-position harness first and then the high-position harness. Check for exposed-wire shorts or solder debris on the board.
Q: Battery pack does not discharge – what should I check?
Start by checking whether an external switch is configured and press it if needed. Use Bluetooth or PC software to confirm discharge MOS status: “1” means allowed and “0” means blocked. If the pack is asleep, wake it by switch, charge or discharge. If the LED flashes at 200 ms, fault protection is active, so review voltage, current or temperature alerts in the app.
Q: Why does the voltage-sensing harness heat up during operation?
A common cause is an incorrect wiring sequence, especially reversed high and low positions. Also confirm that the harness string count matches the factory BMS settings. A mismatch can generate heat and damage internal circuits.
Q: One cell voltage shifts noticeably under load – how can I correct it?
Inspect solder connections on the affected cell and neighboring cells. Make sure the voltage sense wire is firmly soldered. Use soft copper bus bars for inter-cell connections, because higher-resistance power cables can create imbalance.
Q: Why does the load shut off without warning?
Check three likely causes:
1) Battery voltage fell below the over-discharge threshold;
2) Load or inverter power exceeded over-current limits;
3) Large device capacitors triggered short-circuit protection. Connect PC software or the Bluetooth app to read the active fault code.
Q: Power drops during rapid ascent – what should I inspect?
Check whether over-current protection is triggered under high load and adjust protection parameters through PC software if appropriate. Confirm enough remaining charge because low-voltage protection may be active. Inspect all power cable solder joints for cold or loose connections.
21+ Years

Battery Industry Experience

200+

Projects Supported

50+

Global Markets

Supporting 200+ clients in 50+ countries across UAV and energy applications.

CE Certification / RoHS Compliance / ISO Quality System

Engineering Specifications

EF-004 12S-18S Semi-Solid LiPo UAV BMS – Technical Data Overview

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General Electrical Specifications
ItemValue ItemValue
Battery pack series12S-18S Semi-Solid LiPo Communication portsCAN (1M, ID:1) + Type-C + BLE
Power port typeCharge/discharge shared port Operating consumption≤30mA
Charging voltage4.35V x series count Sleep consumption≤2mA
Cell voltage window3.3V-4.35V Deep-sleep consumption≤100uA
Continuous charging current120A Sleep trigger conditionNo current, no communication
Continuous discharge current250A Deep-sleep trigger conditionCell under-voltage state
Operating temperature range-30 degC – 70 degC Board dimensions218.9 x 123.2 x 25mm
Pack-Level Voltage Protection Parameters
Protection category Parameter item MIN TYP MAX Unit
Overcharge protection Overcharge voltage 78.5178.6678.81V
Protection delay –10002000mS
Release voltage 77.9478.3078.66V
Overdischarge protection Overdischarge voltage 59.20*59.40*59.60*V
Protection delay –10002000mS
Release voltage 62.6463.0063.36V
Heating Control Parameters
Item Value
Heating start temperature0 degC
Heating stop temperature10 degC
Heating current10A
Heating power sourceCharge circuit
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PC & MOBILE BMS TOOLS

Ayaatech software tools support intelligent BMS monitoring and configuration. Users can view battery data, adjust BMS parameters, perform calibration tasks and access additional maintenance functions through dedicated battery information, parameter setting, calibration and utility sections.

Windows Tools

CAN PC Host Software

Get Tool

RS485 PC Host Software

Get Tool

Mobile Monitoring Apps

iOS Bluetooth BMS App

Open App

Android Bluetooth BMS App

Get APK

Core Feature Set

Built for dependable protection, clear telemetry and high-load UAV operation

Multi-point Thermal Sensing

Uses multiple NTC inputs across the pack for detailed temperature tracking and safer thermal management.

Isolated RS485 Modbus Link

Provides isolated RS485 Modbus communication with adjustable baud rate and configurable device ID from 0 to 255.

CAN and UART Interface Options

Supports CAN and UART with isolation and communication wake-up for stable data exchange with UAV systems.

Optional Bluetooth Monitoring

Allows wireless mobile-app access to real-time battery status, operating data and diagnostic information.

Adaptable Interface & Display

Combines Type-C, SOC display, LED indicators and configurable display logic for different UAV pack designs.

Configurable Flight Protection Logic

Supports staged warnings and selectable protection responses for
defined fault conditions, helping the UAV system handle abnormal
battery states more safely during flight.

Automatic Storage Mode

Supports self-discharge storage logic with configurable idle timing to help extend battery service life.

Real-time Fault Reporting

Transmits fault data, diagnostic details and system status directly to the UAV control or monitoring system.

UAV Application Scenarios

Smart battery protection for inspection, survey and monitoring drone platforms

Infrastructure Inspection Drones

Reliable pack monitoring for drones used on bridges, towers, power lines and industrial facility inspection routes.

Pipeline Patrol UAVs

Stable high-current support for long-range oil, gas and utility pipeline inspection missions.

Surveying and Mapping Drones

Smart BMS support for survey, mapping and photogrammetry UAVs that need stable endurance and accurate battery data.

Environmental Survey UAVs

Battery protection and telemetry for environmental surveys, forestry observation and remote-area aerial operations.

Fire Monitoring Drones

Configurable battery safeguards for wildfire detection, emergency observation and elevated-temperature operating scenarios.

Security and Surveillance UAVs

Reliable battery telemetry and protection for perimeter monitoring, reconnaissance and surveillance drone platforms.

CERTIFIED OEM/ODM MANUFACTURER

The Power You Want,
The Integrity You Need.

Custom Lithium Battery BMS

High-performance smart BMS solutions for energy storage, EVs, robotics, and drones.

✔ High Efficiency & Active Balancing

✔ Smart Monitoring & Protection

✔ Global Certifications

✔ Customizable for Any Application

1500+
Clients
30K+
Units/Month
20+
Years Exp.

Get Your Custom BMS Solution

⚡ Engineers respond within 12 hours

✔ Free BMS design consultation
✔ Fast response & competitive pricing

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