BM2

by wanbaolu · Tools · Free

On Google Play since May 2016 · Data updated 2026-10-16

Google Play

BM2 is made and published by wanbaolu. AppBrain is an independent app data site and isn't affiliated with wanbaolu. The app name, icon, screenshots and description belong to wanbaolu and are shown as published on Google Play.

AppBrain's verdict

Established

Total installs: 170 thousand
Rating on Google Play: 3.53; 1,902 ratings
Last updated: October 30, 2025

BM2 has 170 thousand installs. Users are divided: 3.5 stars from 1,902 ratings.

Summary

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.

Installs

Tracked by AppBrain

Last 30 days: 1.2 thousand
Per day: 41; 30-day average
Play install range: 100+ thousand
Launched: May 2016

Installs over time

BM2 has been installed 170 thousand times. Over the past 30 days, it averaged 41 installs per day.

Rankings

Google Play top charts

Google Play Rankings for BM2

This app is not ranked

Competitors

Similar apps and more from wanbaolu

Alternatives to BM2

Releases

Updates seen on Google Play

Version: 3.8.0
Launched: May 2016

Oct 30, 2025UpdateVersion 3.8.0
Jun 12, 2025UpdateVersion 3.7.9
Aug 4, 2024UpdateVersion 3.7.8
Jul 12, 2024UpdateVersion 3.7.7
Feb 17, 2024UpdateVersion 3.7.6

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User feedback

Ratings and reviews on Google Play

Google Play Rating history and histogram

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Comments on BM2 for Android

★★★★★ 4008 N Molter · Mar 17, 2026

Easy to install. Charging and battery information at my fingertips. Excellent price. Cant imagine needing anything else to monitor the health of my batteries and charging systems. Installed on my Ram 3500 diesel and my Kia EV6. Could not be more pleased.

★★★★☆ Steve C · Oct 31, 2025

In this app, the battery currently shows 13.0 volts and 84% - what voltage do you expect a fully charged (100%) 12 volt battery to be?

★★★★★ Paul Rodrigues · May 8, 2026

I love this app, and I love the device, I wish I would have an another level where it would tell you what is being drawn off your battery like a pair of draws in the value of amperage per hour, that would be a nice way to figure out if your vehicle has an issue. Otherwise agree app and a great product. Recommended for everyone who has an older vehicle.

★★★★★ 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.

★☆☆☆☆ 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

★☆☆☆☆ M b · Sep 6, 2026

This app is absolute rubbish! Do not purchase this item or think that what you are seeing is correct. My battery went flat with this app showing the battery was in good health! Found out later that app wouldn't connect to Bluetooth, even after 3 reinstallations! Don't waste your time or money on this device!

★☆☆☆☆ 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 😕

★☆☆☆☆ 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!

Technology

Found in the app by AppBrain

Ads: No ads
Price: Free
Libraries: 47
App size: 22.0 MB
Needs Android: 6.0+
Content rating: Everyone

Technologies used by BM2

28 permissions · 47 libraries

Subscribe to see full permission and library details

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.

About the app and developer

About BM2

BM2 is a tools app developed by wanbaolu.

Install Statistics

BM2 has been installed 170 thousand times. In the last 30 days, the app was installed 1.2 thousand times.

User Ratings

BM2 is rated 3.53 out of 5 stars. The rating is based on 1.9 thousand ratings.

App Information

BM2 is freely available from Google Play. The app size is 22.05 MB. The latest version available is 3.8.0. The last update was on October 30, 2025.

Technical Requirements

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

App Performance Report

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Developer information for wanbaolu

wanbaolu

wanbaolufit@gmail.com

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Store listing

By wanbaolu, from Google Play

“Battery Voltage Test,Cranking System Voltage Test,Charging System Voltage Test”

Screenshots by wanbaolu, from the Google Play listing

Description by wanbaolu Written by the developer, not by AppBrain. Click to read.

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 battery startup voltage, and support idle and high-speed charging tests. All data is synced to the mobile app via Bluetooth.

And provides a Wear OS version, with functions including: displaying device data, battery test data, startup test data and charging test data on the Wear side through communication with the mobile phone BM2.

Recent changes:
1. Compatible with Android 15
2. Optimized related details

Official page on Google Play

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