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.
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From the brand
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About Us
KONNWEI is a young and dynamic brand focused on automotive products including obd2 scanners, battery testers, battery chargers, car HUD displays, etc.
Our products combine high-tech with down-to-earth practicality to fix your car on your own. At KONNWEI we explore, we innovate, and we make it happen.
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5-AMP QUICK BATTERY CHARGER
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CAR HUD DISPLAY
Product Description
WARNING:
- If there are abnormal test results, maybe your battery is overcharged or incompletely charged. So, the battery will be damaged or its life will be greatly shortened, then you can take action to deal with this issue.
Know your battery conditions in advance before it dies!
Plug and play--input the rated battery capacity, KW208 will start analyzing the battery's CCA value, charge (%), voltage (v), internal resistance (Ω), rated CCA, battery healthy (%) and display the test result on-screen within seconds.
- Provide 5 kinds of professional advice accordingly:
- GOOD BATTERY: The battery is without any problem, use it without worries!
- GOOD, RECHARGE: Good battery but low current, recharge before using.
- REPLACE: The battery is already or near to reach the end of the using life, please replace the battery.
- BAD CELL, REPLACE: Battery interior damaged, bad cell or short circuit, replace the battery.
- CHARGE-RETEST: Unstable battery shall be recharged and retested to avoid error.
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Multi-tests in One Battery TesterAll-in-one 12V car battery tester with cranking and charging system test, load and alternator tester. |
FAST & ACCURATE RESULTSWith the best STM-32 main chip, KONNWEI KW20812V automotive battery analyzer testing speed is much faster than others, also provide more accurate and reliable results. High precision amplifier calibrated by professional instruments, giving you more precise reports within seconds! |
CONVENIENT TESTING SITUATIONSNo matter the batteries in the vehicles or out of the vehicles, KW208 will finish its testing job excellently, pocketed size let you can bring it to anywhere you want. |
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Support 8 languagesSupport 8 languages. English, Russian, French, Spanish, German, Italian, Portuguese, Dutch. |
Alternator & Starter TestDisplay SOH (State of Health), SOC (State of Charge), Voltage, Current, Rating, and the readable analysis results on the 2.4-inch LCD screen. |
Charging Test & Cranking TestTest different parts of the charging system, including generator, rectifier, rectifier diode, and so on for a reliable charging volt value. The cranking test helps you analyze the starting motor including cranking voltage and the cranking time to check the starting motor works properly or not |
Reviews with images
Not accurate specs in advertising pictures! (Photo Included)
I purchased this because of the screenshot I submitted. Unfortunately, the wires are significantly shorter, barely 3.5 feet. Additionally, within 24 hours of purchase, the (before delivery) price dropped an additional 10%, leaving me more disappointed. I have heard great reviews, so I tested the KW210 on some bench batteries, and it does seem to correctly identify issues of a failing older battery vs a new battery, but I was expecting the wires to be 7.8 feet long from the device to the clamps. As unfortunate as the leads are, I would be open to communicating with the seller before returning this test device.
Top reviews from Canada
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Reviewed in Canada on February 2, 2024
Colour Name: KW208Verified Purchase
Reviewed in Canada on February 18, 2024
Colour Name: KW208Verified Purchase
Reviewed in Canada on June 20, 2024
Colour Name: KW208Verified Purchase
Reviewed in Canada on November 27, 2023
Colour Name: KW208Verified Purchase
Top reviews from other countries
Dana Hordern
Good Quality, Great price
Reviewed in the United States on July 2, 2024Colour Name: KW208Verified Purchase
rajith
A decent product
Reviewed in India on February 14, 2024Colour Name: KW210Verified Purchase
Yankee_s4
Funziona correttamente
Reviewed in Italy on February 10, 2024Colour Name: KW208Verified Purchase
Kevin Schneider
RV Batteries
Reviewed in the United States on June 16, 2024Colour Name: KW208Verified Purchase
Joaquin Escalante
calidad
Reviewed in Mexico on May 26, 2022Colour Name: KW210Verified Purchase