KONNWEI 3 in 1 Car Battery Charger, KW510 Battery Tester 12V 5-Amp Fully Automatic Smart Charger Automotive Pulse Repair Maintainer, Trickle Charger Battery Desulfator w/Temp Compensation

Had a car and ended up replacing with a new battery. The new battery also went dead and I discovered that my trunk light was on and would drain the battery in a couple days sitting. Was going to return the battery I replaced for the $ 10 core charge but bought a battery charger with a repair function and run that on the old battery. Didn't have a load tester and my neighbor was always going to check it but never did. So I ordered this arrived in three days. Checked the battery and the battery was good. Tester said to recharge but the battery only took less than half an hour to charge fully probably because it was already holding its charged. Got a little confused but am impressed that it tests to the battery cca its rated at. Originally wasn't sure whether to set at 1000 or 800 but finally figured out cca means cold cranking amps and set it right. Screen is clear easy to read and the only thing I regret is buying that other charger with repair. This also has repair it pulses a little slower maybe there is a reason but it works somewhat like the other. So for $20 more I now have a good tester and the battery charger combined and don't have to switch. Only drawback I found was that the clamps take some finesse to clamp to a side battery that doesn't have posts but you can get it done. I now have a $ 100 battery I can use in something else rather than a $ 10 core charge so this thing paid for itself in my first try.

****UPDATE*** This charger saved me already around $45.00 My lawnmower tractor battery was completely dead and upon checking / testing the recommendation was to replace it due to bad cell. Then I remained myself that I had purchased Konnwei which was sitting in a trunk of my car.,,,to my surprise this little device repaired bad cell and recharged the battery in less than 5 hours. It already paid for itself !!!!! and tractor starts instantly..... THANKS AGAIN ..... Needed the AGM battery charger/maintainer because my old charger is only good for regular acid batteries. Glad I found KW 510- it is a tester as well. I tested few different vehicle batteries and their charging systems. One battery needed re-charging, which was no problem for this device. Tested again and although voltage is there cranking amps are well below (367 out of 800). I left the charger ON for Trickle/charging/maintaining, to my surprise I am able to start it OK even thought CA are less than half of new working battery. Repair feature did not help resolve the issue, well battery is 5 years old but rarely used-that is what most likely killed it as well. When I get new one I will leave it connected so it can be gently maintained/trickled with very low amps. Time will show how the unit performs, but as of now I am happy and can recommend it.

Overall, this is pretty good. I've tried it out on a good half dozen various flat plate, agm, from little UPS to car batteries. My experiences so far: 3 small dead 5AH UPS batteries either reading 0V or 2V... Pretty much nothing, this wouldn't do anything with them. another 5ah UPS battery and a couple 12ah UPS battery that were all at least somewhat usable. You can only set the CCA for the battery down to 100AH and the UPS batteries weren't rated. So, the 5ah battery showed as being really bad. And it wasn't in great shape anyway. But after the repair, the health numbers did improve. My car had an Optima deep cycle that it drained over a few days. Also, had a good UTV battery that was sitting for months that was dead. Both were at around 6V. For these, the unit would turn on without AC power and give some sort of health readings saying they both needed to be recharged. BUT... The charger couldn't do it. As soon as you told it to charge, it would just blink/beep presumably from overload. Not sure if it would have resolved itself if I left it like that for some length of time... I had another small 6amp smart charger I used in both cases for maybe an hour to start. It also was blinking like it was overloaded, but not as bad and it straightened itself out in a minute. And after that time and the voltage was up over like 10V, then this unit was able to finish the charging without a problem and the health of both was good. Also had a 5 year old cheapy lawnmower battery that neither this nor my 6amp charger would even recognize as anything even connected. But after maybe 10 minutes of playing with the connections with both chargers connected to it, it finally started to show on the chargers as something there. I took off the 6amp charger and this unit now said it was there but very bad health and around 10V It said to replace it. Charging was only putting in less than an amp. I ran the repair on it, and another charge and now it's showing as healthy. So... it's a nice little unit to quickly get some ideas of the shape of batteries, perhaps get a little more life into them and charge them. But, realize that you need to read into the situation, not necessarily just do what it says and that you may need another charger to help get started with good sized batteries that are REALLY low.

For years, whenever my battery isn't working right I've gone to the mechanic or the auto-parts store to have the battery tested. Now, finally for a great price I have a tool to test the battery myself. I'm thrilled! I tried it, and it works great. The tool also saves the most recent test result so you can look at it again later. Here is a picture of my latest test result. Note that while the tool comes with an electric cord to plug into 120V outlet, this IS NOT REQUIRED when testing a car battery as the car battery itself powers up the tool. Note the tool includes 3: battery, battery cranking, and charging system. This tool also has charging and repairing functions (which will require using the 120V cord). I look forward to using these functions as needed.

I bought this in order to repair a car battery. It's really simple to use, but make sure you follow the instructions completely. Make sure to remove the battery from the car before using the repair feature! Make sure to have a good battery memory saver device before removing your car battery. I bought one on Amazon where you can plug it into the wall since the repair process can take a long time. It worked for me after having the battery disconnected for over 11 hours. When you remove the car battery, remove the negative first and then the positive. Make sure that the cables don't touch each other or any part of the car. Wrap the connections with towels to prevent shorting. When you put the battery back into your car make sure you put the positive on first and then the negative. It takes a long time to do the repair process, but it seems to be working very well. I look forward to using this in the future again if I have any issues.

I have a 2006 club car precedent golf cart with 4 12V batteries. We haven't been using the cart much lately and I noticed the charger was staying pegged continually. After some research I purchased the Konnwei KW510 and charged and repaired each deep cycle 12V battery individually. After reconnecting the cables I ran the cart for a while and put it on the charger and within about 10 minutes it trickled back to zero and has been maintaining the batteries perfectly ever since. Btw this set of batteries is 7 years old. Frankly I was shocked how well this little charger worked. I can't imagine how much money is wasted by people who assume all the batteries in a golf cart are bad because the charger stays pegged. Highly recommend this product! Edit: After my glowing review above the next time I went to use the charger it was...useless. I realize it was not expensive but now no matter what battery I connect it to all it does is beep and display a red X continuously. It is totally useless to me now. Do not recommend.

Excelente producto

To start this product works great as a tester and a charger and honestly that’s awesome to find in a combo at such an affordable price. That being said it’s marketed as being able to repair battery’s I tried it multiple times on a few batteries with no luck on any of them. I’d give it five stars if it just didn’t claim to do something it can’t. I just hate to see others buy it thinking this will fix there battery just to find out it won’t.

Ich habe mit einen Batterietester und dieses Batterieladegerät gekauft. Für euch habe ich ein Video erstellt wo ich das Ladegerät mal angeschlossen habe und durch das Menu zappe. Kurze Zusammenfassung : Batterien die etwas Leistung verloren haben können mit diesem Ladegerät etwas aufgefrischt werden (Repair mode) Das Display ist beleuchtet und die Sprache kann auf Deutsch eingestellt werden. Beim Laden wird Akkuladung in Prozent und aktuelle Spannung der Batterie angezeigt! Negatives : Das Ladegerät braucht etwas länger zum aufladen . Das Ladegerät hat wirklich eklig gestunken als ich es das erste mal angeschlossen habe . Nach dem dritten mal wurde es besser ... Es sollte nur benutzt werden wenn die Batterie vom Fahrzeug abgeklemmt ist. Sonstiges Den Tester hätte ich getrost weglassen können denn dieses Ladegerät zeigt nach dem Test absolut identische Werte wie mein extra dafür entworfenes Testgerät. Das bedeutet das dieses Ladegerät also auch eine wirklich ausgereifte Testfunktion beinhaltet. Ihr gebt an welche Batterie Ihr habt (CCA,IEC,EN,DIN,CA oder BCI ) und danach kann das Gerät ziemlich gut feststellen wie es eurer Batterie geht. Ihr könnt die Batterie auch noch reparieren wenn Sie noch funktioniert aber schon etwas an Leistung verloren hat. Ebenso kann man eine Batterie laden. Dies dauert seine Zeit und geht nicht so schnell von statten wie ich das eigentlich erwartet habe , aber auch das ist ehe von Vorteil für die Batterie .

Działanie bez uwag, szybko i bardzo sprawnie ładuje akumulator samochodowy i motocyklowy

Good

Works great, easy to use

Quality is good ,easy user friendly oprations and accurate measurements....