Battery Monitor BM2

Name: Battery Monitor BM2
Rating: 4.1 (59 reviews)
Author: Shenzhen Leagend Optoelectronics Co., Ltd.

by Shenzhen Leagend Optoelectronics Co., Ltd.

iPhone

Active Last checked 6 Aug 2026

App Store ↗

Quick verdict

What it is: Store information collected; independent summary not yet available.
At a glance: Free to download

Categories and search queries

Official categories

Utilities

AppCorpus categories

Utilities

Key functions

Function	Availability	Access	Scope	Evidence
Free app	Yes	Free	—	Store published

Screens

App Store

8 store screenshots

Pricing & paywalls

App Store

Free

Last verified 6 Aug 2026

Ratings & reviews

App Store

4.1 59 ratings · App Store

4/5Possible current draw issue?
I’ve had the BM2 attached to my EV6’s battery for over a year now, since I had the car towed in due to ICCU failure. It seemed to work well, but today while I was listening to the radio in the car while waiting for my wife at a hair appointment, I got a warning screen: “Battery low, come to a safe stop.” I checked the app, it said the voltage was down to 6.5 volts! So I got a guy to jump start me with his 12V battery cables, took my wife to lunch and then home, then onto my local dealer. The manager said they tested the battery, it was fine; the problem was the 3rd party voltage monitor. Its power draw, he said, could be enough to drain the battery dead. At 1.5mA, does that make any sense?

JohntheReed · 6 Aug 2026
4/5Can set custom battery voltage!
Great that custom battery voltages can be set for AGM and Lithium. I use 1 of each and this was an update I was hoping to see. I like that I can set up and monitor 2 batteries but wish I could swipe the screen left or right to see each Battery rather than having to select each battery through the setting menu. Or if both battery could be seen on a single window it would be nice. Really like the app. Get it, you will be happy you did.

Vital4you · 6 Aug 2026
4/5Bluetooth distance is short
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.

parkersmomma1 · 6 Aug 2026
5/5AGM batteries use the same chemistry as other lead acid types.
Contrary to the original post there’s no difference in the chemistry for AGM vs. any other lead acid battery and that is what establishes the battery voltage. There are differences in the charging for various lead acid technologies to optimize the battery life but the basics are the same such as don’t discharge them below 50% capacity or about 12.2 VDC which is the point at which you get a low voltage warning with this software and hardware to optimize your battery life.

elob_tx · 6 Aug 2026
3/5Always Synchronizing?
I bought this to monitor the health of the 12V battery in my BMW i3. I figured I would use it to see how often the DC-DC converter kicks on to recharge the battery. The problem is that the app always seems to be "synchronizing data," which completely locks you out of doing ANYTHING else with the app. I've been able to look at historical info (for the day, for instance) exactly twice in the four days I've had this installed. At all other times, it is "synchronizing data," so not useful for anything else.

TBeavis · 6 Aug 2026

Privacy & accessibility

App Store

Privacy

Data Not Linked to You — Analytics — Diagnostics — Crash Data Developer declared
Data Not Linked to You — Analytics — Diagnostics — Performance Data Developer declared
Data Not Linked to You — App Functionality — Diagnostics — Crash Data Developer declared
Data Not Linked to You — App Functionality — Diagnostics — Performance Data Developer declared
Data Not Linked to You — App Functionality — Location — Coarse Location Developer declared
Data Not Linked to You — App Functionality — Location — Precise Location Developer declared
Data Not Linked to You — Diagnostics Developer declared
Data Not Linked to You — Location Developer declared

Accessibility

No accessibility labels collected yet.

Versions

App Store

3.1.5
Modify the battery notification% symbol duplication problem
3.2.0
1. Add the function of selecting battery type 2. Add custom automatic voltage correction function 3. Optimize more experience details
3.2.1
Modify the pop-up battery type box, and the problem cannot be closed
3.2.2
After repairing the Bluetooth connection of the device, it may flash back
3.2.3
Optimize the firmware upgrade details for connecting BM2 Bluetooth devices
3.3.0
Add Norwegian language support
3.3.1
Modify the lithium battery device,battery type name displays text
3.3.10
Modifying and viewing the startup test page may cause flash back problems
3.3.11
Remove the home page positioning permission prompt
3.3.12
Modify the error problem of historical voltage status
3.3.13
1. Modifying the startup data may cause abnormal parsing 2. Add online customer service function
3.3.14
Modify the problem that Bluetooth may not be connected
3.3.15
Verfication of remove non charging states during charging testing
3.3.16
Optimize for more data details
3.3.2
Battery custom type add "Reset" function
3.3.3
Firmware upgrade add cancel function
3.3.4
1. Add Korean language support 2. Modify the problem that the startup data may not be received
3.3.5
Optimized to view the historical voltage curve graph, there may be no data problems
3.3.6
Optimize Bluetooth connection details
3.3.7
Modify Korean translation
3.3.8
1. Add online customer service function, real-time feedback 2. Optimize permission prompts 3. Add new firmware compatible 4. Optimize more details
3.3.9
1. Modify the problem that the viewing startup test and charging test may flash back 2. Modify the location permission text
3.4.0
1，Add watch version support 2，Optimize other details
3.4.1
Modify Bluetooth details
3.4.2 · 13 Jun 2025
Modify details

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Alternatives

123SmartBMS — Same category + similar ratings
Battery saver - wifi analyzer — Same category + similar ratings

Availability by market

Data quality & evidence

Page completeness: Live store listing
Last verified: 6 Aug 2026
Sources: App Store

Independent summary has not been published yet.

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Example prompt

Compare Battery Monitor BM2 with 123SmartBMS.

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GET /api/v3/apps/1115492033

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          "rating": 4,
          "title": "Possible current draw issue?",
          "body": "I’ve had the BM2 attached to my EV6’s battery for over a year now, since I had the car towed in due to ICCU failure. It seemed to work well, but today while I was listening to the radio in the car while waiting for my wife at a hair appointment, I got a warning screen: “Battery low, come to a safe stop.” I checked the app, it said the voltage was down to 6.5 volts! So I got a guy to jump start me with his 12V battery cables, took my wife to lunch and then home, then onto my local dealer. The manager said they tested the battery, it was fine; the problem was the 3rd party voltage monitor. Its power draw, he said, could be enough to drain the battery dead. At 1.5mA, does that make any sense?",
          "author": "JohntheReed",
          "date": "6 Aug 2026"
        },
        {
          "rating": 4,
          "title": "Can set custom battery voltage!",
          "body": "Great that custom battery voltages can be set for AGM and Lithium. I use 1 of each and this was an update I was hoping to see. I like that I can set up and monitor 2 batteries but wish I could swipe the screen left or right to see each Battery rather than having to select each battery through the setting menu. Or if both battery could be seen on a single window it would be nice. Really like the app. Get it, you will be happy you did.",
          "author": "Vital4you",
          "date": "6 Aug 2026"
        },
        {
          "rating": 4,
          "title": "Bluetooth distance is short",
          "body": "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.",
          "author": "parkersmomma1",
          "date": "6 Aug 2026"
        },
        {
          "rating": 5,
          "title": "AGM batteries use the same chemistry as other lead acid types.",
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          "author": "elob_tx",
          "date": "6 Aug 2026"
        },
        {
          "rating": 3,
          "title": "Always Synchronizing?",
          "body": "I bought this to monitor the health of the 12V battery in my BMW i3. I figured I would use it to see how often the DC-DC converter kicks on to recharge the battery. The problem is that the app always seems to be \"synchronizing data,\" which completely locks you out of doing ANYTHING else with the app. I've been able to look at historical info (for the day, for instance) exactly twice in the four days I've had this installed. At all other times, it is \"synchronizing data,\" so not useful for anything else.",
          "author": "TBeavis",
          "date": "6 Aug 2026"
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      "notes": "Modify the battery notification% symbol duplication problem"
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      "released_at": null,
      "notes": "1. Add the function of selecting battery type 2. Add custom automatic voltage correction function 3. Optimize more experience details"
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      "notes": "Modify the pop-up battery type box, and the problem cannot be closed"
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      "released_at": null,
      "notes": "Verfication of remove non charging states during charging testing"
    },
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      "version": "3.3.16",
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      "notes": "Optimize for more data details"
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      "app_id": 988285264,
      "name": "123SmartBMS",
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    {
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      "name": "Battery saver - wifi analyzer",
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