Auto Battery Monitor BM2 Bluetooth 4.0 12V Device Car Battery Tester

In this review the Quicklynks Auto Battery Monitor BM2 Bluetooth 4.0 12V device is evaluated for drivers, RV owners, boaters and anyone who wants continuous insight into a 12-volt battery. The bottom line: this compact monitor is best for users who want simple, real-time battery voltage monitoring and alerts on a phone without wiring complex meters. Installation is straightforward and the free app provides immediate feedback on charge, cranking condition and trip data, making it a practical tool for routine maintenance and preventing unexpected no-starts.

Key Features

• 12V compatibility: Works with all 12-volt lead acid batteries so it can monitor cars, motorcycles, RVs, boats and small solar systems with the same device.
• Bluetooth 4.0 connectivity: Sends live voltage and status data to the free iOS and Android app within roughly 10 meters for hands-free monitoring on a phone.
• Automatic low-voltage alarm: The device alerts the phone when the battery drops below a safe threshold so users can take action before a failure.
• Charging and cranking tests: Detects engine starting and reports cranking performance and charging behavior so you can spot weak batteries or alternator issues.
• Data logging: Stores up to 31 days of data if the phone is out of range, allowing review of recent trips and battery usage once reconnected.

Who It's For

The BM2 is aimed at vehicle owners who prefer a low-effort way to track battery health: commuters, weekend riders, RV and boat owners who want peace of mind about a 12V battery without a full diagnostic rig. It is especially useful for people who rely on their phones for alerts and value automatic logging of trips and voltage events.

Those who need laboratory-grade accuracy, long-range telemetry beyond Bluetooth range, or integration with a fleet management platform should look for a more advanced professional tester or a telematics solution. Users who do not have a compatible smartphone or who require multi-year offline storage should consider a different product.

Pros & Cons

Pros

• Easy to install and pair, giving immediate real-time battery monitoring on a phone.
• Supports multiple 12V systems including cars, motorcycles, RVs and solar setups with one app.
• Automatic low-voltage alarm and cranking detection help prevent unexpected breakdowns.
• Free app for iOS and Android with data storage for up to 31 days when offline.

Cons

• Bluetooth range is limited to about 10 meters, so remote monitoring from far away is not possible.
• Some users report mixed results on connectivity and perceived battery drain when left connected.

Specifications

Brand	Quicklynks
Model	Auto Battery Monitor BM2
Battery compatibility	All 12V lead acid batteries (car, motorcycle, RV, boat, solar)
Voltage range	9-16V
Connectivity	Bluetooth 4.0 (approx. 10 m range)
App support	Free Battery Monitor BM2 app for iOS 7.1+ and Android 4.3+
Data storage	Up to 31 days when out of sync

Our Verdict

The Quicklynks BM2 is a practical, budget-friendly choice for anyone who wants simple, phone-based battery monitoring and alerts for 12V systems. It offers useful cranking and charging checks and stores recent data for troubleshooting, making it good value for routine maintenance. Buy it if you want a lightweight, app-driven monitor and understand its Bluetooth range and app compatibility limits.

Frequently Asked Questions

Will this work on my motorcycle or RV?
Yes, the BM2 supports all 12V lead acid batteries, so it is suitable for motorcycles, cars, RVs and boats.

What phones are supported?
The free Battery Monitor BM2 app supports iOS 7.1 and later and Android 4.3 and later; download via the app QR code or manual link in the product materials.

Can I monitor the battery from far away?
No, the device uses Bluetooth 4.0 with an effective range of about 10 meters, so it is intended for local monitoring rather than remote telematics.