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

4.4 4.4 out of 5 stars 629 ratings
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Style: Modern
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Purchase options and add-ons

Brand Quicklynks
Power Source Battery Powered
Style Modern
Color Black
Item Weight 2.9 Ounces

About this item

  • It compatible with all 12-volt vehicle batteries;Voltage: 9-16V With Bluetooth 4.0; Supports Solar Power Systems/RVs/Motorcycles/Boats/Cars/Trucks with All 12 Volts.
  • Automatic LowVolt Alarm: Alert user if battery is LowVolt when enters Bluetooth range in 10 meters.
  • Safe and Reliable: Battery load tester tells you everything about the battery: voltage, charge,cranking power, Engine starting detect automatically, etc.
  • Free app for both iOS & Android, IOS: IOS 7.1 and Later Available: Android 4.3 and Later
  • Easy to Operate: Battery Monitor’s App is Battery Monitor BM2. Please scan machine backup or user manual scan code to download software. Connecting Bluetooth and open app, no code, you can know battery or battery load’s Condition and check charging and starting system, list time of each driving.
› See more product details

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 5.91 x 3.94 x 1.97 inches; 2.9 ounces
  • Item model number ‏ : ‎ Quicklynks BM2
  • Date First Available ‏ : ‎ December 30, 2016
  • Manufacturer ‏ : ‎ QUICKLYNKS
  • ASIN ‏ : ‎ B01MT4583U
  • Customer Reviews:
    4.4 4.4 out of 5 stars 629 ratings

Product Description

QUICKLYNKS Auto Battery Monitor BM2 Bluetooth 4.0 12V Device Car Battery Tester For Lead acid Battery

Functions Include:
Battery Monitor
Trip Monitor
Charging Test
Cranking Test

Compatible: All 12v Lead acid batteries, including car, motorcycle, solar, Yachts , iPhone, android phones

Supports Language: Arabic, Czech, German, English, Spanish, French, Italian, Norwegian, Polish, Romanian, Russian, Slovak, Chinese

Features：
Wireless battery monitoring via mobile device
Monitor multiple batteries with the one app
Bluetooth connectivity , free app for iOS & Android (Battery Monitor BM2)
Receive notifications of your battery condition via the app
Alert mobile phone if some data abnormal
Short circuit and reverse connection protection
Data stored for up to 31 days if out of sync
Review and store historical data
Compatible with all 12-volt vehicle Lead acid batteries(do not suit For Lithium batteries)
Records trip duration
Simple, cheap and effective protection

Battery type support: Lead acid, Gel, AGM & Flooded
Compatible: All 12v Lead acid batteries, including car, motorcycle, solar, Yachts , iPhone and android phones
Bluetooth version: 4.0
OS: IOS and Android
Data Storage: 31 days in the device ,unlimited storage in smartphone
Working Temperature: 0 to 50°C (32 to 140 F°)
Storage Temperature: -20 to 70°C (-4 to 158 F°)
Certificate: CE FCC ROHS PAHS REACH
Size: 115*72*20mm(L*W*H)
Weight: 100g

Specifications:
Input Voltage: 6V-20V
Average Current: 1.5mA
Operating Temperature -40 to 90℃
Bluetooth Range: 10 Meter
Product Dimensions: 5.5 x 3.5 x 1.6cm
Voltage Accuracy: (9-16V) ± 0.03V
Bluetooth Name: Battery Monitor
App Keyword: BM2

Package List:
1pc x Battery Monitor BM2
1pc x User's Manual

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    Customer reviews

    4.4 out of 5 stars
    629 global ratings

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    Customers say

    Customers find the electric circuit testing device useful for monitoring battery voltage and usage. They find it easy to install and use, with a simple app that works well. The device provides real-time battery information and allows them to check the state of their batteries before starting a trip. Many customers appreciate its value for money and data retention. However, some have mixed opinions on Bluetooth connectivity, battery drain, and app compatibility.

    AI-generated from the text of customer reviews

    Select to learn more

    FunctionalityBattery monitoringEase of installationValue for moneyData retentionBluetooth connectivityBattery drainApp compatibility
    132 customers mention "Functionality"109 positive23 negative

    Customers like the functionality of the electric circuit testing device. They say the Bluetooth and app work well, it installs and operates perfectly, and monitors voltage. The Bluetooth is pretty strong, they can connect from their upstairs bedroom through a closed door.

    "...No last-minute Suprise! Works at least 40 feet for me. Your results may vary! The history feature is nice...." Read more

    "Great product. I tried two other monitors for my Lithium 12v 100 ah trolling motor battery...." Read more

    "...I was impressed with the app and its display. You see battery voltage at rest, when charging and during cranking the engine...." Read more

    "besides the weak blue tooth signal, it worked fine for nearly 3 months. Now it wont connect at all. Waste of $30.00..." Read more

    52 customers mention "Battery monitoring"52 positive0 negative

    Customers appreciate the battery monitoring feature of the product. They mention it helps monitor battery voltage and percentage, keeping a detailed log of battery voltage status. The device allows them to closely monitor the state of charge, checking not only the battery but also the starting and charging system.

    "...Love the built in alarms. Great price to have the ability to check the battery level on your phone. Getting second one for the Fish-finder battery." Read more

    "...intermittent parasitic drain, and this device keeps a detailed log of battery voltage status to send to my phone (iPhone 13)...." Read more

    "...and app were both really easy to install and allow me to check the state of my 12-v battery well before I start a trip, so I know whether I need to..." Read more

    "...So, think this is big help on battery status indication but not sure about accuracy, recommended buy." Read more

    51 customers mention "Ease of installation"46 positive5 negative

    Customers find the electric circuit testing device easy to install and use. They say it's simple to set up with a wrench and works well.

    "...Simple to install and a real timesaver, especially when you have multiple batteries in different vehicles to monitor." Read more

    "Easy to install and use. Had it a week. So far, so good. Ordered another one. Check your battery while you are having your coffee...." Read more

    "...This is simple to install, just two connectors to the battery. Range is really goid...." Read more

    "...Very easy to install. Paired immediately with my Ioniq 5...." Read more

    24 customers mention "Value for money"19 positive5 negative

    Customers appreciate the value for money of the electric circuit testing device. They find it a good and economical way to check the battery.

    "...Love the built in alarms. Great price to have the ability to check the battery level on your phone. Getting second one for the Fish-finder battery." Read more

    "...All good stuff, and works much better than I hoped for the low price." Read more

    "I bought this because of the affordable cost to monitor my RV battery. It attaches easily to the battery and links to an app on your phone...." Read more

    "...buy the last 3 weeks I'm returning it immediately it was a waste of money and I rather buy a $300 charge controller with a built-in module that that..." Read more

    19 customers mention "Data retention"19 positive0 negative

    Customers appreciate the electric circuit testing device's ability to track usage history and condition of charge. They find the data log useful for gaining insights into battery health and other important information. The app captures all data in a spreadsheet report and stores it locally before downloading the backlog.

    "...Works at least 40 feet for me. Your results may vary! The history feature is nice...." Read more

    "...Paired immediately with my Ioniq 5. I particularly like the graph showing voltage history and the intervals when the car has charged the 12v...." Read more

    "...Bonus is that the device keeps a log that it uploads to the phone when connected, so you don't need to stay constantly connected to get good info -..." Read more

    "...Given the insights the data will provide, I don't doubt this device will pay for itself within a year." Read more

    57 customers mention "Bluetooth connectivity"39 positive18 negative

    Customers have different experiences with the battery monitor's Bluetooth connectivity. Some say it pairs right away with an iPhone 6 or greater, while others mention it's hard to connect, has a limited range, and refuses to communicate at all.

    "...Simple to install and a real timesaver, especially when you have multiple batteries in different vehicles to monitor." Read more

    "...Very easy to install. Paired immediately with my Ioniq 5...." Read more

    "...Now it wont connect at all. Waste of $30.00 When it was working you had to get within 10 feet of the car to get a signal...." Read more

    "...After downloading the app, it paired right away with the unit. I was impressed with the app and its display...." Read more

    32 customers mention "Battery drain"18 positive14 negative

    Customers have mixed opinions about the battery drain. Some mention it provides a plot of battery voltage over time as well as the instantaneous voltage. It captures the battery voltage once a minute, allowing you to view charge and discharge profiles. The state of charge is updated automatically and reports are delivered to your phone daily without having to directly access the battery. However, others say the app drains the cell phone battery and requires access to just about everything on their phone. Additionally, every time the power is lost the device clears its memory so the data has to be reset.

    "I have four of these devices. So nice to monitor battery charge level without having to directly access the battery...." Read more

    "...the battery voltage drop as it sat overnight, seeing a cyclical discharging of the battery. (See photos with my notes overlayed.)..." Read more

    "...This monitor recorded power/percentage drop while using and power increase while charging and alerted me when charged to 100%...." Read more

    "...Unfortunately every time the power is lost the device clears its memory so the data has to be downloaded while the unit is still powered." Read more

    18 customers mention "App compatibility"8 positive10 negative

    Customers have different experiences with the app compatibility. Some find it easy to use and trouble-free, installing on their phone by scanning the QR code. Others report issues like the app not pinning, being buggy, or freezing.

    "...data is quite fine-grained but it appears that it is only collected when the app is connected to the hardware...." Read more

    "...Just connect it to your battery, download and install the app, pair with Bluetooth and you’re ready to go!..." Read more

    "...I installed the battery monitor and downloaded the app. The app did not see the device even though it showed up when I did a Bluetooth scan...." Read more

    "...It attaches easily to the battery and links to an app on your phone...." Read more

    Great tool for diagnosing parasitic current draw from battery
    5 out of 5 stars
    Great tool for diagnosing parasitic current draw from battery
    This is a great tool for diagnosing car electrical problems. Our car battery was draining after two days if it wasn’t driven. I hooked this to the battery and watched the battery voltage go to 14 V as car was driven—charging system good. Then I watched the battery voltage drop as it sat overnight, seeing a cyclical discharging of the battery. (See photos with my notes overlayed.) I finally found the problem—the Bluetooth receiver for the Digital Key system was turning on and off continuously while the car was off, drawing up to 1.2 A. This has a great App you can download for free that acquires data and displays it nicely. Best auto tool ever.
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    Top reviews from the United States

    • SNL
      5.0 out of 5 stars Reliable, easy to install and use, highly recommended!
      Reviewed in the United States on January 27, 2025
      Style: ModernVerified Purchase
      I have four of these devices. So nice to monitor battery charge level without having to directly access the battery. Simple to install and a real timesaver, especially when you have multiple batteries in different vehicles to monitor.
      Helpful
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    • Ron
      5.0 out of 5 stars Easy peasy
      Reviewed in the United States on February 15, 2025
      Style: ModernVerified Purchase
      Easy to install and use. Had it a week. So far, so good. Ordered another one. Check your battery while you are having your coffee. No last-minute Suprise! Works at least 40 feet for me. Your results may vary! The history feature is nice. Could show a coming failure, or be useful to an Auto Tech when a problem develops.
      2 people found this helpful
      Helpful
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    • J. Swain
      5.0 out of 5 stars Bluetooth Battery Monitor
      Reviewed in the United States on April 23, 2024
      Verified Purchase
      Great product. I tried two other monitors for my Lithium 12v 100 ah trolling motor battery. I trusted neither one since it seemed to always show 100% after hours of use. This monitor recorded power/percentage drop while using and power increase while charging and alerted me when charged to 100%. This is simple to install, just two connectors to the battery. Range is really goid. Boat is in garage and it connects anywhere on the same level in the house. Love the built in alarms. Great price to have the ability to check the battery level on your phone. Getting second one for the Fish-finder battery.
      3 people found this helpful
      Helpful
       Report
    • Retired Guy
      4.0 out of 5 stars Works with my EV
      Reviewed in the United States on January 9, 2025
      Style: ModernVerified Purchase
      Keeping a check on the 12v battery is especially important with electric vehicles. Very easy to install. Paired immediately with my Ioniq 5. I particularly like the graph showing voltage history and the intervals when the car has charged the 12v. Has settings for lead acid, AGM, and lithium. Seems to read consistently about .2v lower than my multi-tester. Recommended so far. Don't know how long it will function.
      3 people found this helpful
      Helpful
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    • DH
      5.0 out of 5 stars Great Tool for Battery, Starting and Charging Assessment
      Reviewed in the United States on January 1, 2024
      Style: ModernVerified Purchase
      I don't write many reviews but I liked this so much I wanted to recommend it. It installed very easily on my 2007 Silverado. After downloading the app, it paired right away with the unit. I was impressed with the app and its display. You see battery voltage at rest, when charging and during cranking the engine. I learned that the little solar panel on my dash was not keeping the battery fully charged so I went with a larger panel that does the job. For the price, this is an amazing tool. The range is limited - but quite good considering it's under the hood. I can connect to it from inside my home if I go near a window that's close to the truck.
      4 people found this helpful
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    • Jimmydwight
      1.0 out of 5 stars weak and won't last long. Save your money
      Reviewed in the United States on January 22, 2025
      Style: ModernVerified Purchase
      besides the weak blue tooth signal, it worked fine for nearly 3 months. Now it wont connect at all. Waste of $30.00

      When it was working you had to get within 10 feet of the car to get a signal. Was hoping I could check it inside the house.

      Well, I won't be buying another, I will remove it from the car and toss it in the trash with a lot of things I get from Amazon.
      Helpful
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    • Always A. Skeptic
      5.0 out of 5 stars Surprise! It works
      Reviewed in the United States on August 27, 2023
      Style: ModernVerified Purchase
      I wasn't expecting much, but this does exactly what I need. I'm monitoring for an elusive intermittent parasitic drain, and this device keeps a detailed log of battery voltage status to send to my phone (iPhone 13). The Battery Monitor BM2 app from the App Store (required to use the device) connects via Bluetooth, and I can get a connection from inside my house to the vehicle in the driveway, about 20 feet away. Bonus is that the device keeps a log that it uploads to the phone when connected, so you don't need to stay constantly connected to get good info - just connect when it's convenient, and the most recent data will upload. I haven't yet found my vehicle's parasitic drain problem, but at least I now have a way to know when it is happening (other than discovering a dead battery in the morning). Again, note that the device does absolutely nothing by itself - you have to use the BM2 app on a phone along with it to extract information. By the way, if you double-tap the voltage graph in the app, it goes to a screen where you can view 1 day, 7 day, and 14 day data. All good stuff, and works much better than I hoped for the low price.
      7 people found this helpful
      Helpful
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    • Tim B
      5.0 out of 5 stars Works well!
      Reviewed in the United States on May 12, 2024
      Style: ModernVerified Purchase
      I’m impressed with this easy-to-use battery monitor. Just connect it to your battery, download and install the app, pair with Bluetooth and you’re ready to go! As long as you’re near your vehicle (or whatever you’re monitoring) it will auto connect and download the saved data when the app is launched. It will store up to 30 days of measurements. Since the data is transferred to your device, it’s designed to be used with only one phone or tablet otherwise the data will be scattered across devices. It captures the battery voltage once a minute allowing you to view charge and discharge profiles. I’m using one in my car and one on my 12v solar system.
      6 people found this helpful
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    Top reviews from other countries

    Translate all reviews to English
    • Abdullah Alsayadi
      4.0 out of 5 stars Good device
      Reviewed in Saudi Arabia on October 26, 2024
      Style: ModernVerified Purchase
      Meet my expectations
      Report
    • Ogo
      5.0 out of 5 stars Great for monitoring state your car battery
      Reviewed in Germany on May 20, 2023
      Style: ModernVerified Purchase
      Works great for constant monitoring of your state of car battery. Used it on my Hyundai Kona Electric.
      Report
    • DELPLANQUE Christian
      4.0 out of 5 stars Très utile, mais détecte très mal démarrages diesel
      Reviewed in France on September 12, 2021
      Style: ModernVerified Purchase
      Sensible, bonne longueur de fil, enregistre bien. Attention aux fils : ne surtout pas les modifier (y compris la cosse aluminium) car ils sont double, plats et en aluminium, donc à priori fragiles s'ils sont mal manipulés. Sur diesel, déclenche sur les bougies de préchauffage et très peu sur le réel démarrage du moteur. Dommage. A placer du meilleur côté de la batterie pour conserver une transmission bluetooth max.
      Report
    • Amazon Customer
      5.0 out of 5 stars Great way to monitor a domestic battery in a campervan/motorhome
      Reviewed in the United Kingdom on January 27, 2021
      Style: ModernVerified Purchase
      A very simple and low cost way to monitor a battery use. Highly recommended.

      I have installed it in my campervan on the domestic battery. It gives me a plot of the voltage over the last 30 days whenever I connect my phone by bluetooth. From that it is easy to see the state of charge both when in storage over winter and in active use the rest of the year.

      I've used various amp counting battery monitors before on boats - but nothing as simple and cheap and easy to install as this. And sometimes simple is better.

      My van has a voltage gauge on the battery but this is both more accurate and gives me how the voltage has changed over the last few days. The iphone app works perfectly for this. I've had no problems with this app. It asks for permission to use bluetooth as it has to - so no what sure is meant by asking for "scary" permissions. It just does the job.
      Report
    • SPORTIDEANTA
      4.0 out of 5 stars Aparato Poco bien
      Reviewed in Spain on June 1, 2020
      Style: ModernVerified Purchase
      mio coche golf V en bateria 12V 72Ah 680A en comprobar bateria esta bien pero raro tasacion de bateria. no es 100% por ese mi bateria nuevo, muy raro menos 44%, despues 3 meses mejorado 98% bateria ya esta bien, estoy contento
      Report