Expanded 24V Compatibility

Upgraded beyond basic 12V monitors, BM300 Pro supports 6V / 12V / 24V systems, making it ideal for diesel trucks, large RVs, boats, and other high-demand power systems. A monitoring solution that grows with your vehicle needs.

Comprehensive Battery Health Monitoring

Continuously monitors battery voltage, cranking performance, charging system status, and driving records, detecting abnormal conditions in real time and helping protect your battery before failures occur.

72-Day Data History & Trend Analysis

With up to 72 days of data storage, you can compare battery performance before and after maintenance, gaining a clearer understanding of long-term battery health trends.

Bluetooth 5.3 – Faster, Stronger, Lower Power

Powered by Bluetooth 5.3, BM300 Pro delivers faster pairing, extended range, more stable connections, and significantly reduced power consumption compared to older Bluetooth versions.

One-Time Installation, Always Monitoring

Install once and leave it in place permanently. Access real-time battery health data anytime through the app, with ultra-low power consumption of only 1 mA, virtually no drain on your battery.

＞99.6% High-Accuracy Readings

Equipped with an intelligent chip and optimized connector design, BM300 Pro delivers over 99.6% accuracy. Secure red/black rubber clamps ensure a firm terminal connection for consistent, reliable data.

Built-in Safety & Smart Alerts

Features reverse-polarity protection, short-circuit protection, a fire-resistant ABS housing, and IP67 waterproof rating. Smart alerts notify you instantly via the app if abnormal voltage or battery faults occur.

Wide Application Across Vehicles & Systems

Compatible with all 6V / 12V / 24V lead-acid batteries, including Flooded, AGM, Gel, and EFB types. Suitable for cars, trucks, RVs, boats, motorcycles, off-road vehicles, hybrid vehicles, and solar power systems.

Prevent Failures. Save Costs. Drive with Confidence.

BM300 Pro helps prevent unexpected breakdowns, extends battery life, and reduces costly replacements — all in a compact, easy-to-use monitoring device.

Battery Monitor

ANCEL BM300 Pro 24V 12V 6V Battery Monitor with Charging, Cranking System Test & Alarm