Car Battery Tester 12V, KONNWEI KW208 100-2000 CCA Battery Load Tester Auto Cranking and Charging System Test Scan Tool Digital Battery Alternator Analyzer for Car Truck Marine Motorcycle SUV Boat

Needed this for my EV 12v battery test. Excellent, easy to use meter which proved its worth when it said my battery was ok after 3 years. It should be changed according to the service plan, but is just a money generator for the main dealers. This proved its worth and saved me the price of a new battery which is not cheap. I urge you all to buy one for peace of mind to see whether your battery is winter ready!

great tool

It gives you a useful but limited view of the state of your car's battery and charging system.

Very simple to use, seems to be accurate.

Great investment, saved me spending hundreds of pounds on a new battery when I didn’t need one. Have used it numerous of times for family and friends

I needed to check the health of my car battery and the charging status of my alternator. Battery was faulty, but thankfully the alternator was charging fine. Good tool. And works well.

Having had problems with a 6 month old car battery I found this a very useful took tho help be sort out the issue and get the battery replaced under warranty. Good value.

Nice little tool, does what it says but the screen is small and I'm not 100% sure if the readings are correct

MUY BUEN PRODUCTO

As user Chafik said this doesn't give the correct SOH or SOC because it isn't taking into account the temperature. For example: I used this at +5 deg C today and it was reading 12.49V. But when I ran the tester it was saying my SOC was something like 68%. Why? That isn't remotely correct. A battery at +5C has a max charge of 12.501V meaning my SOC was closer to 99.9%. It was reading my CA as 760A and my CCA as 560. Bear in mind neither of those numbers are the true CA or CCA since this device doesn’t correct for temperature. You can estimate your CA and CCA using what this device gives though. It’s fairly easy using excel. CA is determined at 0 deg C and CCA determined at -18 deg C. CCA = CA/1.25 (which is all this device is doing when you switch between CA and CCA modes). Ignore the SOC and SOH %’s this device gives they are irrelevant and incorrect. So go in excel and plot your x-axis as temperature. Test your battery in CA-mode for your first data point. So for me I put +5C as 760A. and “CCA” is 18C lower than CA so I put -13C as 560A which I got by testing my battery in CCA-mode. Plot a trendline and you can calculate your true CCA and CA. My true CCA is then 504A and my CA is 704A. The device was telling me my SOH was 100% but in reality it’s closer to 97% since my battery is rated as 520A CCA. Taking more readings would make it more accurate of course. Update as of December 2025: Still using the same product today. Still works great. As long you plot the data as I mentioned above with x-axis as temperature, y-axis as amps, you'll get the right data. Just a tip: you need to let your battery adjust to ambient temperature. Lead acid battery containers are ABS which is a bit of an insulator. If you turn your car on, boost your battery, or charge your battery, the liquid in the battery will be hotter than ambient thus skewing readings even if you do the corrections as I noted. I see a lot of negative reviews and most seem related to not taking into account as to how much temperature affects battery chemistry. A hypothetical battery fresh off the production line with brand new lead plates charged to 100% will read as 0% health, 0% charge at -55 to -65ish celsius (the freezing point of battery acid). You either wait for ambient to match CCA or CA or you plot some graphs.

Lo he probado en varias baterías y funciona perfectamente, sencillo de utilizar y muy fiable. Una manera rápida de checkear una batería 12v de manera fiable. Complementario a otro probadores como puede ser el densimetro y comprobador de alta corriente para testesr la descarga.

L'oggetto funziona bene, in manuale è scarso, ho lasciato la lingua inglese anche se nel menu esiste l'italiano. Ho testato alcune batterie, quelle che sapevo leggermente fiacche sono state testate come da sostituire. Direi che ci siamo. Con un video su Youtube ho trovato come testare le batterie degli ups, opzione che mi servirà molto al lavoro. L'oggetto è di plastica senza gomma di protezione, applicherò della spugna sottile da coibentazione con diadesivo per proteggerlo. Al momento sembra ok. Se il display si accende ma non compare la tensione della batteria significa che il contatto sui morsetti non è buono, dopo aver riposizionato tutto ok. Aggiornamento, eseguito test a 40 batterie nuove AGM pronte da montare su UPS, sono rimasto sbalordito, come da foto, letture perfette ci sono piccole variazioni ma è normale. Lo consiglio alla stragrande!!!

This product is damaged please kindly guide next process of warranty