# Battery Monitor BM2

> Real-time vehicle battery monitoring via Bluetooth for voltage and system testing. (iPhone/iPad app by Shenzhen Leagend Optoelectronics Co., Ltd..)

- Source: https://appshunter.io/ios/app/battery-monitor-bm2/id1115492033 (this page in markdown: same URL + `.md`)
- Developer: [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621)
- Category: Utilities
- Price: Free
- Rating: 4.10/5 from 59 App Store ratings · 226 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 56 MB
- Languages: American English, Arabic, Czech, French (France), German (Germany), Italian, Korean, Norwegian Bokmål, Polish, Romanian and 5 more
- Released: 2016-05-23
- Data updated: 2026-08-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/battery-monitor-bm2/id1115492033/reviews.md

## What is Battery Monitor BM2?

Battery Monitor BLE is an application for vehicle battery,which can let them know the real-time voltageof car battery.
It helps users to know the battery fully by testing cranking and charging system voltage. 
All of the datas can be showed on mobile through bluetooth.

## Key features

- Real-time voltage monitoring
- Cranking system testing
- Charging system testing
- Bluetooth data transfer
- Historical data display

## What do users think of Battery Monitor BM2?

Overall sentiment: neutral

**Pros**

- 👍 Multi-device support
- 🚀 Useful monitoring app
- 📈 Good historical data
- 🔋 Accurate battery readings

**Cons**

- 🐛 Connectivity issues
- 🔋 High data usage
- 🔍 Limited customization options
- 💤 Syncing problems

**Commonly reported bugs**

- App crashes on certain screens
- Firmware update not working
- Inconsistent battery percentage readings
- Compatibility issues with iOS 13

**Most requested features**

- Add CarPlay support
- Ability to export data
- More battery type options
- Remote monitoring capability

## Recent user reviews (10 of 226)

All indexed reviews: https://appshunter.io/ios/app/battery-monitor-bm2/id1115492033/reviews.md

### 4/5 — Bluetooth distance is short

*2026-07-13*

The device actually connected easily and works quite well. My problem is I have to be very close to the car for it to connect to the Bluetooth. Not sure if this is this particular apps Ben issue or if it is just how Bluetooth is.

### 2/5 — No lithium

*2026-06-25, version 3.4.2*

There should be better support for lithium batteries

### 1/5 — Synchronizing Data

*2026-03-03*

The majority of the time when I open this app it connects to Bluetooth, and then starts synchronizing data and the synchronization never ends. While the is doing that it is not usable, it’s like it’s froze up. This has been going on for a few years now rendering the app useless.

### 3/5 — Poor Connectivity

*2026-03-01*

Cannot connect even a few feet away in the house.  Apparently no way to work with Home Assistant or BT repeaters.  So I was never notified of a low battery.   That was the purpose.

### 4/5 — Multi Car Uses

*2026-01-24*

I have 4 of these installed on two classic cars and two electric cars. Works great. Very nice to monitor your charging system on the fly. The app need a way to rename the devices.

### 4/5 — CarPlay App or Widget would be great

*2025-12-22, version 3.4.2*

CarPlay App or Widget would be great

### 3/5 — Lescars

*2025-12-18*

Leider funktioniert die App nicht mehr mit den neuen Wächtern von lescars, wurde irgendetwas geändert?

### 3/5 — Traveller

*2025-11-24, version 3.4.2*

I have 1 battery for driving and 2 (classed as 1 as it is linked) for RV life…..BUT I CAN NOT VIEW BOTH BATTERIES AT THE SAME TIME !!!
Frustrating !

### 1/5 — Keine Verbindung

*2025-09-19*

Seid IOS26 verbindet sich Gerät nicht mehr mit Handy…

### 3/5 — Need more settings

*2025-07-06, version 3.4.2*

I have a question about low limit measurement voltage level. Now is the range from 9-15 only. The input voltage is from 6V. is it  automatically range, when lower values will occur? It is possible set lower limit  (2V) by customer in next version ?

## Frequently asked questions about Battery Monitor BM2

### What can Battery Monitor BM2 do?

Battery Monitor BM2 allows you to check your vehicle's real-time battery voltage and test its cranking and charging systems. All data is transmitted to your mobile device via Bluetooth for easy viewing.

### Is Battery Monitor BM2 free to use?

Yes, Battery Monitor BM2 is available for free. There are no in-app purchases or subscription fees associated with its use.

### What devices does Battery Monitor BM2 support?

Battery Monitor BM2 is compatible with iPhone, iPod, and Apple Watch devices, offering multi-device support for monitoring.

### How often is Battery Monitor BM2 updated?

The latest version of Battery Monitor BM2 is 3.4.2, and it was last updated on June 13, 2025. Updates ensure continued functionality and improvements.

### What is the age rating for Battery Monitor BM2?

Battery Monitor BM2 has an age rating of 4+, making it suitable for a wide range of users to monitor their vehicle's battery.

### What do users like and dislike about Battery Monitor BM2?

Users appreciate its multi-device support, usefulness as a monitoring app, good historical data, and accurate battery readings. However, some users have reported connectivity and syncing issues, as well as high data usage and limited customization.

### Does Battery Monitor BM2 have ads?

No, Battery Monitor BM2 does not contain advertisements. Users can monitor their battery without interruptions.

### How does Battery Monitor BM2 connect to a car battery?

Battery Monitor BM2 connects to your vehicle's battery system via Bluetooth. This allows for wireless transmission of real-time voltage and system test data to your supported mobile device.

## Version history (last 5 releases)

### 3.4.2 — 2025-06-13

Modify details

### 3.4.1 — 2024-04-02

Modify Bluetooth details

### 3.4.0 — 2023-11-02

1，Add watch version support
2，Optimize other details

### 3.3.16 — 2023-07-24

Optimize for more data details

### 3.3.15 — 2023-07-07

Verfication of remove non charging states during charging testing

## Apps similar to Battery Monitor BM2

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Battery Life - check runtimes](https://appshunter.io/ios/app/battery-life-check-runtimes/id1080930585) | 4.6 (33,586) | Free | Utilities |
| [Battery Widget: CPU x Monitor](https://appshunter.io/ios/app/battery-widget-cpu-x-monitor/id1571029388) | 4.4 (1,320) | Free | Utilities |
| [Battery Life Health Doctor Pro](https://appshunter.io/ios/app/battery-life-health-doctor-pro/id1180887748) | 4.4 (7,889) | Free | Utilities |
| [Battery Widget 2.0](https://appshunter.io/ios/app/battery-widget-20/id1561658854) | 3.9 (47) | $7.99 | Utilities |
| [Battery HD+](https://appshunter.io/ios/app/battery-hd-plus/id331453283) | 4.5 (2,714) | Free | Utilities |
| [Battery saver - wifi analyzer](https://appshunter.io/ios/app/battery-saver-wifi-analyzer/id1178712789) | 4.2 (233) | Free | Utilities |

## More apps by Shenzhen Leagend Optoelectronics Co., Ltd.

- [BLUE LIGHT](https://appshunter.io/ios/app/blue-light/id998450290)
- [OBD Pro](https://appshunter.io/ios/app/obd-pro/id1063199690)
- [Leagend Auto battery tester](https://appshunter.io/ios/app/leagend-auto-battery-tester/id1090786879)
- [BT1 Tester](https://appshunter.io/ios/app/bt1-tester/id1098097935)
- [OBD Plus](https://appshunter.io/ios/app/obd-plus/id1208901144)

All apps by Shenzhen Leagend Optoelectronics Co., Ltd.: https://appshunter.io/developer/6798210621

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-18.*