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Battery Monitors

12V Bluetooth Battery Monitors

12V Bluetooth Battery Monitors

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What is a Battery Monitor?

Checking the health of your battery systems is made easy with Ultimate9's Bluetooth Battery Monitors (BBM) and Ultimate9 BM App, available on the Apple Store and Google Play.

Designed to monitor the voltage and charge status of your batteries, engaging with your smart device via Bluetooth, this multifunctional unit is easy to install and simple to use. The BBM collects data from your vehicle’s battery that is not otherwise visible on your dashboard. 

So, whether you’re on the move or settled in for the night, put your mind at ease knowing the health status of your 12V battery system.

Why Do I Need One?

Reduce the risk of a dead battery and all the hassles that come with it, the BBM system communicates seamlessly with the BM App via Bluetooth. Perfect for long trips, traveling off-the-grid or checking battery status on lesser-used vehicles in storage, you can ensure a healthy battery with Ultimate9 Bluetooth Battery Monitors which are available for both lithium and lead acid 12V batteries.

The Ultimate9 BM App allows you to set two alarms, alerting you to low-voltage situations and the need to recharge. Providing cranking and charge system tests, this accessory is a cost-effective, preventative solution to issues that may arise from a lack of battery monitoring.

Bluetooth Battery Monitor

Monitoring the health of your battery systems with our lead-acid Battery Monitor

Lithium Bluetooth Battery Monitor

Monitoring the health of your battery systems with our Lithium Battery Monitor

Codebreaker Handheld OBD2 Scan Tool

Pint-sized Tracking - follow in your pet’s path, wherever they may wonder

What is OBD2?

On-Board Diagnostics (OBD2) is a standardised system that allows external electronics to interface with a car’s computer system. It was introduced in 1996 as a means of regulating emissions and as a solution to the mass adoption of electronic fuel injection by automakers. Electronic fuel injection requires computer control as it regulates fuel flow by interpreting electronic signals from various engine related components, rather than just mechanical throttle actuation.

Diagnostics are the primary purpose of the OBD2 system. Upon detecting something amiss, a vehicle’s sensors will trigger a message or ‘trouble code’ which, if detected three consecutive times on vehicle start up, will trigger the ‘Check Engine Light’ on the dash. OBD2 scanners check these trouble codes and determine where these/any problems lie. Once a problem is resolved, the OBD2’s memory can be  cleared, and the ‘Check Engine Light’ will no longer be on.

Battery Monitor Frequently Asked Questions

Battery Monitor Frequently Asked Questions

Can I monitor multiple batteries on the Ultimate9 BM App?

Yes. The Ultimate9 BM App can store information from multiple monitors at a time. However, only one Bluetooth Battery Monitor is able to be accessed and read at a time.

Do I need more than one Bluetooth Battery Monitor if I have two batteries?

Dual battery systems with an isolator switch or DC/DC charger, for example, will require one monitor per battery.


Batteries fitted in parallel will only require one battery monitor as the batteries are connected to act as one.


For any other setups, please don’t hesitate to contact us for further details.

Can this device be used on a cranking battery or only on an auxiliary battery?

Yes. Ultimate9 Bluetooth Battery Monitors are compatible with both cranking (main) and auxiliary batteries.

What is the connecting range for the Bluetooth Battery Monitors?

The average connecting range of the Ultimate9 Bluetooth Battery Monitor is around 10 meters.

I'm experiencing an issue or am having trouble connecting the device to the app.

A common cause for connection issues between apps and relevant devices can be traced back to location services being disabled. These services might have been disabled either in the application during installation or in the phone's general settings.


To resolve this:


  1. Find the app you wish to use in your phone's SETTINGS menu.
  2. Find the LOCATION setting within the settings > [App] menu and make sure to enable or allow this setting.
  3. If this did not resolve your issue, check that your phone's overall location services are also on.
Why do location services have to be enabled when Bluetooth is enabled?

While some applications do not require your location to function, they will require MAC addresses (Media Access Control). The MAC unique identifier is used to confirm the app is communicating with the correct device, i.e. your Bluetooth Battery Monitor.


When location services are disabled, this can prevent apps from accessing a device's MAC identifier to communicate the correct information.

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