# BM2

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

Canonical page: [https://chrome-stats.com/d/com.dc.battery.monitor2](https://chrome-stats.com/d/com.dc.battery.monitor2)

## Overview

- **ID:** `com.dc.battery.monitor2`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** wanbaolu
- **Category:** TOOLS
- **Downloads:** 173,065
- **Rating:** 3.58 / 5 (1,975 ratings)
- **Version:** 3.8.0
- **Last updated:** 2025-10-30
- **First published:** 2016-05-25
- **Publisher country:** CN
- **Size:** 22 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.dc.battery.monitor2)
- **Privacy policy:** [http://doc.quicklynks.com/bm2/privacy-policy/index.html](http://doc.quicklynks.com/bm2/privacy-policy/index.html)

## Description

BM2 is a powerful Chrome extension designed for comprehensive car battery monitoring. It provides real-time voltage readings, historical voltage tracking, and automatic startup voltage testing. BM2 supports both idle and high-speed charging system tests, ensuring your vehicle's electrical system is performing optimally. All gathered data syncs seamlessly with your mobile device via Bluetooth for easy access and analysis.

Additionally, BM2 offers a dedicated Wear OS version that displays device and battery test data directly on wearable devices. With features that include battery test metrics, startup voltage status, and charging system performance, BM2 ensures you stay informed about your car battery's health wherever you go.

## Rankings

- #170,534 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_BACKGROUND_LOCATION`
- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.ACCESS_LOCATION_EXTRA_COMMANDS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.ACCESS_WIFI_STATE`
- `android.permission.BLUETOOTH`
- `android.permission.BLUETOOTH_ADMIN`
- `android.permission.BLUETOOTH_CONNECT`
- `android.permission.BLUETOOTH_SCAN`
- `android.permission.CAMERA`
- `android.permission.CHANGE_WIFI_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE`
- `android.permission.INTERNET`
- `android.permission.MODIFY_AUDIO_SETTINGS`
- `android.permission.MOUNT_UNMOUNT_FILESYSTEMS`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.READ_MEDIA_AUDIO`
- `android.permission.READ_MEDIA_IMAGES`
- `android.permission.READ_MEDIA_VIDEO`
- `android.permission.RECORD_AUDIO`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `com.dc.battery.monitor2.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.gms.permission.AD_ID`

## Review summary

BM2 is praised for easy installation, at-a-glance battery/charging data, and strong value across vehicles. Common concerns are limited lithium/AGM presets, unreliable auto-connect, inaccurate voltage-to-SOC readings, and occasional instability. Users want better auto-connection, accurate SOC readings, and true lithium support. Overall, it’s a handy, affordable monitor for many setups, but not ideal for lithium batteries or flawless reliability.

### Pros

- Easy to install and simple setup.
- Shows battery, charging, and health data at a glance.
- Great value / affordable price.
- Reliable performance across a range of vehicles (cars, RV, EVs, bikes).
- Allows monitoring without opening the vehicle doors (hands-off monitoring).

### Cons

- Limited presets for lithium/AGM batteries; lithium support is missing or hard to configure.
- Auto-connect is unreliable and may not reconnect automatically when nearby.
- Voltage-to-SOC percentage readings are often inaccurate.
- Occasional instability: works well at times, but can stop functioning for some users.

## Similar extensions and apps

- [ANCEL Battery Monitor](https://chrome-stats.com/d/com.dc.battery.monitor2_ancel) — 18,781 users, 3.52 / 5
- [BM6](https://chrome-stats.com/d/com.dc.bm6) — 58,842 users, 3.00 / 5
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- [Ultimate9 BM](https://chrome-stats.com/d/com.dc.battery.um9) — 6,907 users, 3.43 / 5
- [ANCEL BM200](https://chrome-stats.com/d/com.dc.bm6_ancel) — 49,402 users, 2.90 / 5
- [Smart Battery 24V](https://chrome-stats.com/d/com.dc.bm7) — 6,143 users, 3.44 / 5
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- [BKmonitor](https://chrome-stats.com/d/com.jiawei.batteryonline) — 14,892 users
- [ANCEL BM300 Pro](https://chrome-stats.com/d/com.dc.bm7_ancel) — 13,888 users, 2.13 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.dc.battery.monitor2)