BM2

3.8.0

wanbaolu

3.54

1,891 reviews

100,000+
Downloads

Free

Battery Voltage Test,Cranking System Voltage Test,Charging System Voltage Test

BM2 is a Bluetooth-powered car battery monitor that delivers real-time voltage readings, historical voltage trends, and automated startup and charging tests, all synced to your phone. It also offers a Wear OS companion experience to view device and test data on your wrist. Recent updates include Android 15 compatibility, showcasing ongoing refinement of this mature tool.

Pros & Cons

Real-time voltage monitoring with historical trends.
Bluetooth-based data sync to the mobile app.
Wear OS companion for on-wrist access to data and tests.
Automatic startup voltage testing and charging tests.
Android 15 compatibility and ongoing updates.

Compared with some competitors, BM2 does not emphasize time-based or health-related metrics in its feature language (e.g., time, health, current, power).
Uses a broad set of permissions (location, Bluetooth, storage, camera) to function, which may raise privacy considerations.

About BM2

BM2 is a tools app developed by wanbaolu.

How many times has BM2 been downloaded?

BM2 has been downloaded 170 thousand times. In the last 30 days, the app was downloaded 1.5 thousand times.

What is the rating of BM2?

BM2 is rated 3.54 out of 5 stars, based on 1.9 thousand ratings.

Is BM2 free?

BM2 is free to download. The APK download size is 22.05 MB. The latest version available is 3.8.0. The last update was on October 30, 2025.

What are the requirements for BM2?

BM2 requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play May 2016.

Description

Battery Monitor BLE is an application for car battery monitoring, which can monitor the real-time voltage of the car battery; count the historical voltage of the battery; it can automatically test the

More data about BM2

Price	Free to download
Total downloads	170 thousand
Recent downloads	1.5 thousand
Rating	3.54 based on 1.9 thousand ratings
Ranking	Not ranked
Version	3.8.0
APK size	22.0 MB
Number of libraries	47
Designed for Android	6.0+
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the BM2 app

BM2 compared with similar apps

Common keywords of similar apps

Car Startup Wear Battery Test Voltage Data Charging System Monitor Mobile

Keywords missing from this app

Time Temperature Status Health Current Level Device Real Charge App Capacity Power Percentage Recent Display Phone Screen History Information Application Support Full Info Features Batterysnap Graphs Widgets Fast Bt Dcpm Protection Type Mah Control Analyzer Bms Users Bluetooth Key Notification Easy Monitoring

Google Play Rating history and histogram

800

310

240

150

370

Downloads over time

BM2 has been downloaded 170 thousand times. Over the past 30 days, it averaged 51 downloads per day.

Changelog of BM2

Show changelog

Developer information for wanbaolu

wanbaolu

wanbaolufit@gmail.com

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Comments on BM2 for Android

★★★★★ kevin auman · Jun 22, 2024

I tell you what for $20 you sure get alot of very useful features/information about your batteries, I own 2 of these 1 for each vehicle & I know my voltage is a bit low to hit the remote start & let it charge up also I compete in car audio, so it helps to know the current voltage accurately & these are very close... Wish I was able to display both batts at once not have to go back & forth between them if I could suggest any additional features that'd be the only thing I'd improve... A+++

★★★★★ michael muchard · Apr 24, 2025

I've been using this device for several years on all of my auto, tractor, RV and RV toad batteries. It works great. Not only does it show the battery state-of-charge, it also shows the battery performance during starting which is a good indication the battery's remaining life. I found it so useful for monitoring my motor home's toad's battery while towing that I bought devices for my friends as a gift.

★★★★★ David B Sears · Jun 4, 2025

I'm having a problem with battery charging on an MG5. Purchased a solar charger and installed, plus a battery monitor with a download of the BM2 app. When the ignition switched ON, showing 14.3v, switched OFF showing 12.6v, but solar charger is increasing this figure constantly, even when switched OFF. So it looks as though the items attached to cigarette lighter were drawing power off the battery while switched off?

★☆☆☆☆ bob haz · Apr 17, 2026

Why?\n Do you need access to all my phone data I don't want you monitoring where I'm at all times how fast I'm driving. Where all stops, I make Where I live when I'm home, when I'm not home. Somebody stares at me with binoculars. Reporting back to a third party is not acceptable. You peeping Tom, you. How is this acceptable? Peeping, Tom is against I just wanted to know what the level My battery was on my car. Now, your software has made the battery monitoring device undesirable

★☆☆☆☆ AI AIN · Jul 31, 2025

App's voltage to percentage value is off by 30 percent. It shows my voltage as 12.23 volts as 38 percent. Look at any 12 volts car battery chart on the web, 12.2x volts is 60 percent.

★☆☆☆☆ Andrew · Dec 1, 2024

App requires location access to function. There is no technical (functional) reason for this; it just exists to collect and send your data to China. Beware!

★☆☆☆☆ Ronald Erlston · Apr 23, 2025

Microsoft Defender has flagged this app on my Samsung phones as malware! Disappointing as the app was quite useful. Will only reinstall if cleared by Defender 😕

Google Play Rankings for BM2

This app is not ranked

Technologies used by BM2

BM2 is requesting 28 permissions and is using 47 libraries.

Permissions

Development tools

test access to protected storage

Your location

approximate (network-based) location, precise (GPS) location, access extra location provider commands

Network communication

view network connections, view Wi-Fi connections, pair with Bluetooth devices, full network access

Storage

modify or delete the contents of your USB storage

Hardware controls

take pictures and videos, change your audio settings, record audio, control vibration

System tools

access Bluetooth settings, connect and disconnect from Wi-Fi, access USB storage filesystem, prevent phone from sleeping

Extra

android.permission.ACCESS_BACKGROUND_LOCATION, android.permission.BLUETOOTH_CONNECT, android.permission.BLUETOOTH_SCAN, android.permission.FOREGROUND_SERVICE, android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE, android.permission.POST_NOTIFICATIONS, android.permission.READ_MEDIA_AUDIO, android.permission.READ_MEDIA_IMAGES, android.permission.READ_MEDIA_VIDEO, com.dc.battery.monitor2.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION, com.google.android.gms.permission.AD_ID

Ad network libraries

None found

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Android Jetpack Annotations Android Library Icon

Android Jetpack Annotations Android Jetpack Widgets Android Library Icon

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State AndroidX Loader Android Library Icon

AndroidX Loader Android Jetpack Media Android Library Icon

Android Jetpack Media

Android Transition Support Library Kotlin Android Library Icon

Kotlin

Android Support Library collections

Android Support VectorDrawable

AndroidX Legacy: Support Library core utils AndroidX App Startup Android Library Icon

AndroidX App Startup AndroidX Cursor Adapter Android Library Icon

AndroidX Cursor Adapter

AndroidX Local Broadcast Manager Google gson Android Library Icon

Google gson

Android Support Library Print

Android Support Library Document File

AndroidX Legacy: Support Library core UI AndroidX Widget ViewPager2 Android Library Icon

AndroidX Widget ViewPager2 AndroidX Emoji / Emoji2 Android Library Icon

AndroidX Emoji / Emoji2

Android Support Library Async Layout Inflater Okio Android Library Icon

Okio

AndroidX Concurrent Futures JetBrains Annotations Android Library Icon

JetBrains Annotations IntelliJ IDEA Android Library Icon

IntelliJ IDEA AndroidX Tracing Android Library Icon

AndroidX Tracing Glide Android Library Icon

Glide

AndroidX ProfileInstaller AndroidX ExifInterface Android Library Icon

AndroidX ExifInterface AndroidX DynamicAnimation Android Library Icon

AndroidX DynamicAnimation AndroidX Resource Inspection Android Library Icon

AndroidX Resource Inspection ReactiveX Android Library Icon

ReactiveX

The Checker Framework Android Library Icon

The Checker Framework Android View Binding Android Library Icon

Android View Binding Reactive Streams Android Library Icon

Reactive Streams greenrobot EventBus Android Library Icon

greenrobot EventBus AndroidX Graphics Android Library Icon

AndroidX Graphics AndroidX GridLayout Android Library Icon

AndroidX GridLayout

BaseRecyclerViewAdapterHelper Android Library Icon

BaseRecyclerViewAdapterHelper SmartRefreshLayout Android Library Icon

SmartRefreshLayout AndroidUtilCode Android Library Icon

AndroidUtilCode Umeng Android Library Icon

Umeng

SwitchButton

Trust & Safety: BM2 requests a wide range of permissions including background location, location, network state, Bluetooth, storage, camera, and more to support Bluetooth data syncing and Wear OS features. Users should review the app’s privacy policy and ensure permissions are granted on least-privilege basis.

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