The basic functionality of this app is good. The app is a little strange though, in terms of it's features.Pros: Displays up to four batteries status on the home screen; has useful ability to measure the instantaneous voltage changes such as during engine cranking; quickly refreshes battery status.Cons: Has strange choices by the developer, such as unrelated features like Trip Mapping, Highway Tolls and Parking expense recording. Each trip can be saved as a Personal or Business trip. These are features I would not expect or want in a battery monitor. A larger design limitation is that you can set whether the batteries are Starting Batteries or Storage Batteries, but the setting affects all four batteries. So, if you are like me and have one Starting Battery in the Tow Vehicle, and one Storage Battery in the Travel Trailer, you cannot access both profiles. You must choose one profile or the other which is then set for both batteries.I urge the developer to remove all the Trip logging features, and instead focus more on the Battery Monitor features, such as setting the battery type by individual battery.

I was previously using the BM2 battery monitor app by this developer for more than a year. Decided to take the plunge and purchase a second battery monitor for a second vehicle. Before purchasing this app I ensured that I could connect via the old app to both monitors, and I could. However I could only monitor 1 battery status at a time. After purchasing this app, I am delighted to report that I can connect to 2 separate monitors and view current voltage, percentage to full, and historical data. There is also an import function that pulls all existing data, quite a nice feature. Is it expensive? Yes, at $9.99, it is not cheap, but the value it provides me to monitor the state of multiple cars is worth the small investment. The UI is developed in a clean and easy to understand fashion. I am a Software Developer myself and can appreciate something well developed. I’ll report back after longer term useage. Nice work devs.

It works pretty good, but as of lately the cranking test, charging test, trip, and my report buttons don’t work. When you push them, the app says synchronizing data and never does anything.

I bought two battery monitors keep tabs on my two car’s batteries. This app lets me check the voltage and daily historical graph from both at the same time! I can walk to my window and not even go outside and I know if my cars need a charge. I also tried it on my RV and was a great way to see basic solar charging voltage.I wish it would load in the background without hanging the app. That would make it 5 stars for me.I read some of the other reviews but decided to try this anyway. And I’m happy I bought it considering how much more work it would be to figure out the state of charge of multiple cars.