KONNWEI KW600 12V Automotive Battery Tester Professional 100-2000 CCA 220AH Car Battery Load Analyzer and Alternator Tester for Car/Boat/Motorcycle

I purchased this item on the basis that my wife's car sounded as if it was struggling to start, no doubt after fewer journeys during Coronavirus lockdown, and testing the battery before it conked out completely might save the eye watering cost of £400+ for a new one - start/stop batteries ain't cheap!I am not a car mechanic by any stretch of the imagination, and there are many cheaper battery testers available on Amazon, however this one appealed to me because as far as I could tell, all you need to do is attach the crocodile clips to the battery (the tester tells you if you get them the wrong way round!), and follow the instructions on the screen - type of battery (EFB for mine) measurement standard (CCA), if the battery is connected to the car or not, and off it goes!There are only 4 buttons, so you really can't go wrong, and it tells you if your battery is good, needs recharging, needs replacing, is damaged, or needs to be re-tested when disconnected from the car. In my case, the battery needs a recharge, so that's £400+ saved, thanks very much!!For those of you who want to go further, you can put your battery through a more thorough test by starting the car with the tester still attached to see how the voltage drops and recovers, so effectively, as far as I can tell, you are also testing the starter motor and alternator, and you can even print out the results so you can show them to a proper mechanic!!All in all, I can't fault this little device - as I said, not the cheapest, but certainly not the most expensive (there is one over £100) but it is robust and the crocodile clips are well made and have a strong grip, plus the screen is bright and easy to read, plus no batteries required as it is powered from the car battery.Highly recommended, 5 stars through and through.

Very pleased with this, easy to use and seems to be accurate. The only uncertainty is that it says the battery has excellent health, and yet it says the cranking voltage is low. That suggests the problem isn't with the battery and yet the battery quickly loses charge so I'm not certain. Guidance covering these sort of scenarios would have helped. At least I know that the battery might not be the problem.The only other problem is that the instructions give no mention of the fact that in modern cars the battery voltage tends to drop for a while when you open the car door to access the engine compartment or if the engine compartment has a light. So to get consistent and reliable results, you need to ensure there is no light on in the engine compartment, and give the voltage time to settle down after unlatching the bonnet and closing the car door. For my car, I need to wait half an hour.I also recommend the auto battery monitor (amazon product B08F9ZN5XW) which complements this Konnwei tester, because that monitors the car battery voltage constantly and it made it so I knew how long to wait before the voltage had settled down before more thorough testing with the Konnwei. See my review of that product too.

For automotive tools go this may not beexpensive but wish I had this at the beginning of pandemic lock downs rather than towards the end. Lack of use of cars meant the 12V lead-acid batteries ran down rather quicker than anticipated. Bought and replaced battery on wife's car. As my car had a recent battery change was disappointed with it so sent it back for investigation to see if mine was a dud but before that had to get a battery for the car so as to avoid internal rechargables batteries (there must be many for the various sensors) from going flat. The battery dealer rejuvinated the first one. So now have 3 batteries between two cars so wish I had this before we inadvertently drained the batteries.Anyhow, this meter is easy to use. However, probably due to inexperience rather than fault of the meter (or the car battery) the results were not consistent, or so it appeared. However, after lock lodwn ended and cars being used weekly (or put on a charger weekly) results became more consistent. Whether batteries were healthier, me being more experienced in using the meter, not conclusive. All I can say is the meter would give me earlier warning to go get the battery topped up on the charger whereas previously I relied on a multimeter only, so guess the multimeter was late to give me a warning.If your battery is nearly dead, then this won't work as it takes energy source from the battery you are testing to pwoer it up.