---
title: "BM2 battery monitor"
description: "BM2 battery monitor is a Marketplace integration for Home Assistant. It has 56 installs sharing analytics, works locally and was last updated September 4, 2026."
canonical: "https://vulpo.app/integrations/marketplace/andystewart999-ha-bm2monitor"
url: "https://vulpo.app/integrations/marketplace/andystewart999-ha-bm2monitor.md"
last-updated: "2026-10-22"
version: "1.4"
---

# BM2 battery monitor

> BM2 battery monitor is a Marketplace integration for Home Assistant. It has 56 installs sharing analytics, works locally and was last updated September 4, 2026.

BM2 battery monitor is an integration that reads battery information from BM2 devices over Bluetooth. It works locally, and Home Assistant discovers the devices on its own and offers to add them. The integration creates sensors for battery voltage, percentage and general state. It uses an explicit connection to the device instead of BLE broadcasts, which carry only the percentage. Battery chemistry can be chosen, and this changes how percentage and status are calculated from voltage. Options cover a limit on how often sensors update and custom voltage values for a battery, such as the thresholds for low, critical, floating and charging.

Automatic summary of the README and code of andystewart999/ha\_bm2monitor. Something wrong, or are you the maintainer and want your own text here? [Get in touch](https://vulpo.app/contact)

[Open in My Home Assistant](https://my.home-assistant.io/redirect/hacs_repository/?owner=andystewart999&repository=ha_bm2monitor&category=integration)

On Home Assistant 2026.11 or newer? [Open it in the Marketplace](https://my.home-assistant.io/redirect/marketplace_repository/?owner=andystewart999&repository=ha_bm2monitor&category=integration)

## Supports

- **Works locally**: Talks to your devices on your own network. No vendor cloud in between.
- **Found by itself**: Home Assistant spots it on the network and offers to add it.
- **From the Marketplace**: Installed through the Marketplace, formerly HACS.
- **Actively maintained**: Its author released or pushed a change in the last six months.

## Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

### BM2 Battery Monitor

- **Bluetooth device**
- **Battery chemistry**

### BM2 Battery Monitor discovered

- **Battery chemistry**

### After setup

- **Sensor update rate limit:**
- **Sensor update rate limit (seconds)**
- **Battery chemistry**
- **Battery name, type or chemistry**
- **Critical voltage threshold (0% remaining)**
- **Low voltage threshold (20% remaining)**
- **50% remaining voltage**
- **100% remaining voltage (while not being charged)**
- **Floating voltage**
- **Charging voltage**

Texts from the code of [andystewart999/ha\_bm2monitor](https://github.com/andystewart999/ha_bm2monitor).

## From the README

> A custom integration to monitor the BM2 battery monitor via Bluetooth.
>
> It discovers BM2 battery monitor devices and creates sensors based on battery voltage, percentage and general state via explicit connection rather than BLE broadcast, which is what most other BM2-supporting integrations do. BLE broadcasts only contain the percentage unfortunately.

From the README of [andystewart999/ha\_bm2monitor](https://github.com/andystewart999/ha_bm2monitor#readme), [MIT License](https://spdx.org/licenses/MIT.html). Shortened.

## At a glance

- Kind: Marketplace integration
- Category: [Hubs and protocols](https://vulpo.app/integrations/category/hubs-and-protocols.md), Wireless protocols
- Number: 56 installs sharing analytics; 9 GitHub stars
- Connection: Works locally
- Upkeep: Updated in the last 6 months
- Needs: Needs the Marketplace (HACS on 2026.10 and older)
- Latest version: v1.4.1, last updated September 4, 2026
- Domain: `ha_bm2monitor`
- Source: <https://github.com/andystewart999/ha_bm2monitor>
- Issues: <https://github.com/andystewart999/ha_bm2monitor/issues>

In Vulpo: Chart card, Apple Watch

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/marketplace/andystewart999-ha-bm2monitor

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