FNIRSI BTM-24 Car Battery Tester Review — 12V 24V CCA Load Cranking Charging Test

Unboxing and real-world testing of the FNIRSI BTM-24 battery tester. See how to test 12V and 24V batteries and know when replacement time is coming. Amazon product link: https://amzn.to/3ZXyPdu (affiliate link) As an Amazon Associate I earn from qualifying purchases. Using this link does not change the price or create any disadvantages for the buyer. In this video, I unbox and test the FNIRSI BTM-24 Car Battery Tester and walk through firmware updates, menu navigation, and all test modes. This automotive battery analyzer supports 12V and 24V systems up to 2000 CCA and checks battery health, voltage, internal resistance, cranking performance, load results, and charging system behavior. I show how it works and explain how to read the Good, Fair, or Low results to decide if a battery can stay in service or should be replaced. The FNIRSI BTM-24 supports multiple battery types and standards, includes reverse polarity protection, a color display with day and night modes, and USB-C firmware updates for long-term usability. Hashtags: #carbatterytester #automotivebattery #batterytest #alternatortest #crankingtest #vehiclemaintenance #diyautocare #toolreview #garagegear #carrepair Disclaimer: I am not a professional mechanic or electrician. This video is for informational and educational purposes only. Always follow manufacturer instructions and use proper precautions. I am not responsible for damage, injury, or loss resulting from the use of this information.