Bluetooth Battery Monitor Review

I recently got sent a few battery monitors, and thought I’d install them to see what the fuss is all about.

The two battery monitors that I’ve reviewed are the Oricom Battery Sense Monitor, and the Autohil ABM2.  Both these devices are designed to connect to your battery and monitor the performance.  But what exactly do they do?

A Bluetooth Battery monitor allows you to track the voltage of your battery via your smartphone.  It allows you to see how the voltage drops with usage, see the current condition of the battery, understand the cranking voltage, and also measure the charging voltage of the battery.

The voltage is useful as a measure of charge of the battery – as the battery depletes, the voltage drops, and once it gets below a certain level (usually 12V or below), then the battery is considered discharged, and may no longer start your vehicle.

If you are having issues with your vehicle, the monitor can check the charging voltage to make sure it is normal.  If it is outside the acceptable ranges, that could help indicate an issue with the alternator rather than the battery.

The other thing that can be great about a battery monitor is connecting one where your battery may not be easily accessible as it can save time trying to get access to it with a multi-meter.

Out of the box, both the Oricom unit and the Autohil unit are very similar.  They are designed to simply connect across the terminals of the battery, and also have built in circuit protection in case you wire them the wrong way.

The first thing I noticed with the units was that the Autohil cabling felt a bit thicker than the Oricom unit, although the Oricom unit comes with double sided tape to stick it to your battery, where the Autohil one doesn’t.

Connecting the monitors was as easy as easing off the nuts on the battery connections, sliding the clips in, and tightening again.  From there, all I had to do was download the software.  Details were included in the instructions, and after a few minutes, I had both apps installed. 

In basic operation, both monitors were very similar, performing many of the same functions.  The key differences I noticed were that the Autohil version only allows one battery to be monitored at a time.  You can connect a second monitor and switch to that, but you can’t view them at the same time without paying for a multiple monitor app. The Oricom unit on the other hand, will allow you to monitor up to 4 batteries upfront.

In contrast though, the Autohil version allows you to set battery alarm levels to alert you when the battery is low.  The Oricom unit will alert you to the status of the battery when in range, but I couldn’t find anywhere that it allows you to set the alarm levels.

Both products also track over a months worth of battery usage, and show the effect of voltage over time, so you can see how usage changes over the time of day, and also get a feel for the health of your battery.

Will they work on Lithium Batteries?

Yes, the monitors will work on a Lithium battery, however, with reduced functionality. The voltage will be displayed correctly, however, the profile built into the monitor is based on a regular lead-acid style battery rather than a Lithium battery, which means the charge state of the Lithium battery won’t be accurate because Lithium batteries voltage stays much more consistent during discharge than other types of batteries.


Retail: Autohil ABM2 – $50.00

Oricom Battery Sense monitor: $59.00


A Bluetooth battery monitor can be a useful tool to understand your battery condition, and what might be driving that.  The Oricom version is more expensive, but comes with double sided tape to mount it more easily, and can monitor multiple batteries at once.  The Autohil version is a little more customisable, and a little cheaper, but you’ll need to invest in upgrading to a paid app to manage multiple batteries at once, unless you are happy to manually switch between the monitors using the app.

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Comments 12

  1. Interesting. I have a similar thing on my Waeco CFX75. The fridge Bluetooth’s to my phone so I can keep an eye on it whilst around the campfire. It also has a USB port on the fridge to charge up the phone for tunes. With 2 x 110 amp/hr deep cycles, I can go for 3 days if I dont pull the solar panels out.

  2. The app that the Autohil tells you to download is called BM2 which only allows one battery to be monitored at a time but if you search for the BM3 app it allows you to connect up to 4 of these (or any of the generic versions available online) at once. I’ve currently got one on my starter battery, auxiliary battery and camper battery and can see them all together at the same time.

  3. The Autohil model uses an app called BM2 which is also used by quite a few other battery monitor devices including Matson… all much cheaper than Autohil.

  4. I purchased 2 of the Oricom BT BM units. But the range of reception is really poor! I have to be basically at the bonnet of my Landcruiser to get signal. Unlike my fridge temperature BT units, I get 12-15m range & they are obviously inside my fridges, so you would expect that they would be worse for signal. It would be nice if Oricom would fix the signal problem and swap them out for us. Really disappointed. I thought that they would be good units coming from Oricom.

  5. Will never by another BT Battery monitor had the BMPRO Battery Check Lithium absolute useless piece of equipment Readings were all over the place constant dropouts, failed to connect. Now located in my trash and treasure pile.

    1. Post

      Thanks for the comment Mark. For our Lithium battery we use the Victron Bluetooth Shunt. Awesome bit of gear!


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