HulkmanSigma 10, 10A 12V/6V Car Battery Charger for 30-240Ah, Battery Maintainer and Float Charger, Trickle Charger with Desulfator for Lead-Acid, LiFePO4 Battery, Automobile, Truck, Motorcycle, RV

As an electrical engineer I am very impressed with this product. Even its packaging is about the best I have ever seen. The materials and construction are very high quality. Its operation is straight forward and the large and bright display tells you exactly what it is doing. It was designed in the United States and is manufactured in China; the end result is a high quality and professional looking product.I purchased the Sigma 10 charger because it will properly charge multiple types of vehicle batteries, including the AGM battery used in my car.Newer vehicles with their highly complex electronic systems need the battery to be well charged, yet in the interest of higher MPG ratings, short trips will not recharge the battery fully. This charger has a permanent home in my vehicle so that when needed I can bring the battery up to full capacity.The Sigma 10 charger has a 3 year warranty, but that increases to 4 years if you register with Hulkman.The charger can serve as a 12 volt 10 amp power supply for other applications such as providing temporary power to your vehicles on-board computers to keep them happy while you replace the vehicle battery. The manual was not clear on how to select this mode, but Hulkman support responded quickly saying to Press & hold the "OK" button for 3 seconds to enter "12V Supply" mode.

I have a car that I do not use very often and I use this charger to keep its battery charged. I am glad I got it instead of getting a new battery. In Arizona, because of heat, the car batteries stop functioning and we may have to replace the car batteries usually every two or three years. When my car did not start, instead of trying to get battery replaced, I decided to use this charger after watching YouTube videos about it. It worked perfectly and saved me some money. It has a very nice display.

From the moment you open the premium packaging, it’s clear this is a high-quality device. I took some time to mount it and route the cables so they hang neatly over my vehicle, and so far, this charger has been impressive!My only complaint is with the nine foot extension cable connection—it doesn’t click securely into the adapter that connects to the battery terminals and doesn’t seem to seat properly. Hopefully, this is just a minor issue. See image for reference.

Nice in size compared to a traditional car battery charger. The screen is large and easy to read. Plenty of charging options. It allows for slow and fast charging. It also has a repair option for older or bad batteries. I am pleased with it.

I think of products that look nice as eye candy, and products that feel nice as palm candy… That said, Hulkman products seem to fit both descriptions. I don’t really have any complaints about this charger, but a little more labeling for the buttons, or better instructions on the unit itself would be helpful. A battery charger is not the kind of thing that most people would keep the instructions around for. This unit isn’t exactly complicated, but it isn’t exactly easy to use if you’ve never opened the instruction manual, either. Claims to come with a three-year warranty that was extended to four years after I registered. Hopefully I never need to use it.

I bought all the lineup of Sigma chargers(1,5,10) for both my car and motorcycle and general use. From my experience there is now way that this charger will leave your battery discharged.Also i like the float voltage that the Sigma 10 charger that sits at 13.7V-13.8V,where most chargers will sit at between 13.3 and 13.6. Robust build quality, nice big display and minimalistic design. Highly recommented, worth every penny.

I have several of the Noco ones. I decided to give this brand a try. I am very happy with it.The display turns out to be a huge advantage over Noco. I love the feature that if you leave it connected to the battery and unplug it from the wall, it will continue to display the voltage of the battery. This was great to keep track of the self-discharge of an AGM battery that was giving me trouble. After the 620 CCA AGM battery tested poorly even after recharging out of the vehicle, I left it charging on the Hulkman for a week and then unplugged the Hulkman to see if the battery would keep the charge, and it did for several days. I retested it with the Autel and it is now at 100% SOH and 723 CCA. I found that hard to believe so I repeated the test with an old resistor pile tester and got the same results. This is just the first time I used the Hulkman and I do not consider this experience to be a real experimental result, but I can at least report that the Hulkman charges batteries, has a nice display and feature, and just might be able to recover a battery. I have used many other battery chargers that claimed to be able to repair a battery and have seen them fail to do so, but this might be the first time I might have actually seen it happen. Not to say that only the Hulkman works, since it was the only one I tried on this battery, but I now have hope that it is possible in some cases and I will have to pay more attention to this in the future.My time on this Hulkman is limited so far, so I cannot predict its lifespan or behavior in other situations, but if I do find anything else about this charger, I plan to try to update this review. For now, two thumbs up and Noco better take notice. I am pleased with this purchase.

Best purchase ever. tested on a 12V AGM dead battery left it charging over night. The next morning battery is fully charger checked the battery charger for any sign of overheating. everything is ok the charger is self was cold. Good heavy duty quality device. And it’s safe & easy to use for new rookies.