Anyone using a "BM2" Bluetooth battery monitor?

**BradC** · 1st June 2023, 03:05 PM

Stumbled across this when looking for BLE battery monitor reverse engineering.

Discovering that your Bluetooth car battery monitor is siphoning up your location data - doubleagent.net

TLDR

A Bluetooth enabled battery monitor that records car battery voltages. The hardware requires a smartphone to pair to
The product collects GPS co-ordinates, cell phone tower information and nearby Wifi access point information
GPS data sent over Internet to Hong Kong. Via AMap SDK, GPS, cell data and Wifi data sent to servers in mainland China
App store misleads consumers by stating that no personal data is collected or shared. Android app requires location permissions to work.

There are no legitimate reason for a car battery monitor application to track it’s user’s location. With over 100,000 downloads on Android alone, this raises significant privacy concerns

**p38arover** · 1st June 2023, 03:53 PM

I have a couple but to be honest, I tend to forget about them.

There is a thread on here about them.

BM2 Bluetooth Battery Voltage Monitors

**Tombie** · 1st June 2023, 04:33 PM

I have 6… D4 has 2, RRS has 2, D90 has 2

Very handy

I don’t forget about them as they are set to send push notifications to my phone

**one_iota** · 1st June 2023, 05:49 PM

The new Defender gobbles power so it's handy to know what the SOC is. The BM2 works well but I have to tell the phone to ignore the app as it is persistent.

**Tombie** · 4th June 2023, 10:55 AM

Originally Posted by one_iota

The new Defender gobbles power so it's handy to know what the SOC is. The BM2 works well but I have to tell the phone to ignore the app as it is persistent.

Change the polling time in the app

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