Review on Battery Monitor BM2 BM3 Bluetooth 4.0 Wireless Battery Tester for 12V Automotive Battery Load Testing, 🔋 Monitoring Automotive Charging Systems, and Cranking Analysis. A Digital Battery Analyzer Applicable for Android & IOS Devices by Rudy Hilmy

Let me start by saying that this device does exactly what it is advertised to do. So this part is good. Small, compact and easy to install, it can be held in place with a simple cable tie wrapped around the battery terminal. The application is very pleasant, it is easy to install and connect. right and good. It serves its purpose very well if you understand and accept its limitations. I really like the trip monitoring tab in the app. This keeps track of recent rides and shows the date and time of the ride and the duration of the ride. The reason I like it is because I do a lot of city driving and therefore my battery is almost never fully charged due to short trips. Experimentally, I found that my car needs 20-30 minutes of driving a day for the car to fully charge the battery. So this feature helps in that regard. The historical data recorded and the graphical readings that you can scroll through to view specific VDC readings at a specific point in time are great. However, the device has several disadvantages, namely: 1) It does not always show the exact voltage. Actually. It appears that the voltage readings tend to fluctuate by as much as 30 millivolts. Continue. while it appears accurate in a hot engine compartment with a fully charged battery. when things cool down and battery voltage drains out of your battery over time. it appears to be less accurate. After 24 hours. When I compared his reading to the actual multimeter reading, I saw a difference of up to 60 millivolts. Currently. it's not just any tragedy. you just have to know. This is on my device and it may be partly because I have an older battery (over 2 years old) but I'm just not sure. 2) I find the battery life % reading to be generally pessimistic and inaccurate. The good thing is that it's pessimistic. So it doesn't tell you that the loading percentage is higher than what you actually have. The bad part is that you can't use percentage charge as a measure you can rely on. For example. At 12.4V the battery is claimed to be 65% on my device but with my battery tester. I can confirm that the battery is indeed 75-80% charged. Likewise. as soon as it reaches a value of 12.4. This will cause the battery status indicator to turn red, indicating that your battery is clearly undercharged. Although this can be true for a brand new battery. for an old battery that is no longer operating at 100% efficiency and performance. it's just not accurate. it said. I just ignore the % Charge reading and just rely on the battery voltage readings. 3) I'm not sure about the initial voltage readings. It does not provide consistent results for the same battery level. So I think it's probably fine as an "on/off" monitor in relation to your battery's engine cranking status, but I wouldn't trust the recorded voltages. I like that it shows the initial cycle in the graph. This allows you to see the actual reaction of your battery during the boot process. The disadvantages mentioned above are understandable. The device is very useful and works as it should. There simply isn't an accuracy that would be ideal in terms of voltage reading consistency. It outperforms other products in many ways due to its Bluetooth connection to the app and the fact that it records a full 30 days of data for viewing at any time. This gives you a good idea of your car's behavior and battery life over time when the car is parked. So install and control as you please. This product cannot be beaten by any of the competitors I currently see.