Car Battery Tester 24V 12V Load Tester, TOPDON BT200 100-2000CCA Automotive Alternator Tester Digital Auto Battery Analyzer Charging Cranking System Tester for Car Truck Motorcycle ATV SUV Boat Yacht

Works great. I like the features that it has for checking the battery and charging system. It is simple to use.

This battery tester worked excellent and was very accurate. It was a great value for the money and quick and easy to use

A definite must have for anyone who enjoys (or otherwise, must) working on their own vehicles. The instructions were simple to follow and the results were just as accurate as the one used by my local Autozone and just as good as the one used by one of the local repairs shops. I've not used these outside of the aforementioned places and I'm happy with my purchase. Car batteries are the easiest items to replace and even easier to test. Every car owner should keep one!

"I used this tester on a 4-year-old battery that I suspected was failing. The device is very easy to use, and I ran all three tests—Battery, Cranking, and Charging. It indicated that the battery was still good, but I wasn’t sure what all the numbers meant. This tester saves the info. So, I entered the results into ChatGPT, which explained that while the battery was still functional, it might need replacing soon—especially in cold weather. With temperatures dropping to -10°F in the mornings, that was valuable insight. Overall, a useful tool for checking battery health!"Based on your battery test results, here’s what each reading indicates about its overall health and performance:ChatGPT results1. Health: 66% – This suggests that the battery has lost a significant portion of its original capacity and is starting to weaken. It may not hold a charge as well as a new battery.2. Charging: 87% – The battery is mostly charged, so it's not a charging issue causing the low cranking power.3. Internal Resistance: 6.3 mΩ (milliohms) – Higher internal resistance reduces the battery’s ability to deliver current quickly, which is crucial for cranking. A new battery typically has lower resistance (below 5 mΩ for a good one), so this indicates some aging.4. Loaded Voltage: 11.94V – When under load, the voltage drops significantly. Ideally, a healthy battery should stay above 12.2V under load. This drop suggests the battery is struggling to maintain power when demand is high (like starting the engine).5. Unloaded Voltage: 13.97V – This is normal for a fully charged battery, but the significant voltage drop under load confirms that the battery's ability to supply power is declining.6. Ripple: 5mV – This is a low ripple, meaning your alternator is providing stable voltage with minimal fluctuations.Conclusion:Your battery still functions but is weak and deteriorating. The high internal resistance and voltage drop under load indicate that it may struggle to start your vehicle reliably, especially in cold weather or under heavy electrical loads.Recommendation:If your vehicle is slow to crank, you should strongly consider replacing the battery soon.If you’re not experiencing cranking issues yet, monitor it closely, but be prepared for a replacement in the near future.Cold weather will make the issue worse, so if winter is coming, a new battery would be a wise investment.

I have many automotive batteries, boat, car, camper etc. I always want to make sure a battery is shot before I buy new, and sometimes it is nice to know a battery is on the way out before it leaves me stranded.Likeshas no internal battery as it just used the battery your testing to power itselfSeems to do well as I tested in on newer and mid-life and a old battery, I got health readings from 100 to 60% and even one that said battery was no good (and it was) It also has a few other test functions for charging and starting of vehicles. Since I did not have a interest in those features at this time I did not test them. It was very easy to use!Dislike.The original packaging was OK, but now that I have it out, I would have like a little bag or better packaging that it would be easy to put back in. I want to keep it in one of my vehicles tool bins so it is handy when I have a problemWill find a cloth back with draw string at some point in the future.Would buy again.

I have been using this for about 3 months now. I've been a mechanic for 15 years and I am very confident with the test results, ease of use, and the display is easily photographed for the pictures I attach to repair orders

It's a good tool to have especially when you have multiple vehicles. I've used it several times and it works. I recommend it.

Easy to use. Well-made.