Does what it does well. Like the repair cycle.This little beauty is currently hooked up to 1500 pound battery set up in an electric fork truck. It has been on for a week now and it is restoring the entire battery pack a little at a time. This is saving me a lot of money. Great product and will pay for itself many times on this project alone. I wish everything I buy would work this well Thanks AmazonGreat charger. Had to cut off the alligator clips and use a different connector. That is the only bad thing about this charger. The connector is not interchangeable.just what I needed for my ride on mower after the long winter.this charger is compact but it will recharge even a fully dead battery worked greatI have had many problems with my car battery, this product has worked for me to charge the battery fast, it has a good design, it feels resistant, it even detects the type of battery that I connect to it.I was looking for a charger that would handle AGM batteries, especially ones that had been sitting for a while. A nice feature is the 24V option which kicks in automatically. So if you are charging a pair of batteries for a scooter or wheelchair, you won't have to taken them apart. A nice feature of this charger is that it will power off when the battery is fully charged, but it will also turn on and off as necessary as it gets near a full charge.If you have a 12V battery that has low voltage (3-6V) the charger may not work directly. For complex reasons, you have to provide a lot more current in a battery that has been deeply discharged. So what you can do is use booster cables and connect the low battery to the good battery. (positive-to-positive, negative-to-negative) Leave them connected for a couple minutes. If your good battery is in a car, leave the car OFF.After a couple minutes, connect the charger to the low battery and set it to the *repair* mode. Let it charge for a few minutes, and then remove the booster cables. If the charger keeps going, let it run. If the charger turns off, connect the booster cables again. Usually within 5 minutes you should be able to disconnect the booster cables.I was able to recover a number of batteries this way. Let's be clear, you won't end up with a 'good as new' battery. But if you are dealing with wheelchair batteries that cost $500 for a pair, you likely will be happy to have working batteries, even if they only hold 75% of a charge. How much of a charge you get will be dependant on the age of the battery, and how long it has been discharged.If charging batteries indoors, never leave them unsupervised. Check once an hour and feel the battery to see if it is getting hot. If it gets too warm, shut off the charger, let the battery cool, and then resume it later. Once you have gotten the battery to the point where it is 'warm' and you shut off the charger, you shouldn't need booster cables again.Overall, this charger is a handy device to have in your tool bag.I tested it out on my wife old car. The battery was drained from her remote car start unit in the car. It had not been started for over a month. First time when I hooked it up. I keep hearing a ticking noise in the relay box. Not knowing what that was. So I unhooked the negative terminal. And try to charge it that way. Ticking noise was gone. But not knowing how long it will take some the indicator show only 20%. So I decide to hook the negative terminal back on and charge it.This time when I hook everything up and then plug the power on. The car alarm started to horn at me. I then realised the ticking noise was from the relay to the horn when I first hook it up. I could of just turn off the alarm on the remote and keep the charger attached and do it's work. Anyway. I turn off the alarm with my remote and let it charged over night. And the battery is recovered from the dead. Started the car with no problem.Will try that on my motorcycle this winter and see how it goes.Works well only setting you need is type of battery and then let it do it's job great value for the moneyI like the pulse repair mode and that it can keep my batteries charged over the winter months.I don't understand how this is so highly rated, it's very light, feels cheap. It says my battery is 100% charged when in fact it's complete drained and requires charging. The box in came in also seemed like it was used before that or it was damaged anyhow I don't recommend this. I used this in a well ventilated garage so it wasn't a temperature issue. The devices just goes to off automatically saying it's at 100% I tried this on other car battery's from other vehicles and apparently they all are 100% not one single time did it try to charge. I'm returning this product.