This is a game changer as I can go a month or more not using my boat and have previously taken it to an auto parts store to test and charge the battery and now I can do it at home! Very easy to use and charged the battery up overnight without a problem

I love the fact that i can keep my boat battery charged all the time. It works very well and i have no complaints other than the cord length could be longer.

I bought a new Die Hard battery for my Chevy Truck 8 cylinder. It sat for about 9 months with the battery unhooked but still in the truck. It needed a jump with my NEXPOW 2000A portable jump starter which I highly recommend. After that I couldn't get the truck to hold a charge. I tried my old timey 4A battery charger for days at a time. After charging it would start but not hold the charge. I thought I might have to buy a new battery. I bought this unit because it claims it will desulfate the battery. I hooked it up and eventually it did go into "SUL" or desulfate mode. At first, I unhooked when it said that because the "bad battery" LED also lights up. I read the instructions again and that is normal. I thought maybe I messed up the progress, but after re-hooking up the charger it is smart enough to go do what it needs to do. Battery is now holding a charge like brand new. Just went on a trip for 10 days and truck started up no problem! This charger is ingenious and well worth the money. Also extremely light weight and leads are plenty long. I have to use an extension cord cuz my truck is on the street. I leave the charger under the hood and run wire out from under. If I could leave the extension cord through the yard for months at a time without the lawn guy chopping it up, I would leave it on to trickle charge as well. I highly recommend!!!

With sturdy construction and easily understandable directions, this was my best Amazon buy ever. It's not totally noise free, but neither is it annoying. This unit is lightweight, portable, and easily carried or stored in even the smallest of trunks. I'm considering buying a few more for Christmas gifts for loved ones whose cars I'd not want stranded by weak or dead batteries.

The plug is standard for any outlet. I can leave this plugged in and use it during very hot or very cold weather, and in rain, sleet, snow - you name it. The charge is effected safely and quickly, bringing batteries back from even the lowest of charge levels. Once finished charging, this unit maintains the full charge even if the vehicle is unused for months. It automatically adjusts how much electricity is sent from any outlet to your battery, reducing the electricity when your battery is charged.
How much electricity is flowing from an outlet to your battery? The unit sends enough electricity to quickly and fully charge your battery. Then, it allows just a trickle of electricity to flow to your battery, so your full charge is maintained. That means you're not overpaying for electricity, even if you plug it into an outlet and forget it. It won't hurt batteries by overcharging, even if attached and plugged in every day of every month.

It does not get hot. It does not need attention or servicing. I can hook it up, plug it into any outlet, and leave it without worrying about anything.

It's safe and effective inside a garage, parking lot, driveway, or for on street use. An extension cord can be used if the cord provided is not long enough, but the accompanying cord seems sufficient for most uses.

Summarizing, all batteries lose charges over time. This unit safely and dependably charges weak batteries, then maintains batteries by constantly sending a small trickle of electricity to make up for those anticipated and usual lost charges.

I had a bad experience with a product that I had purchased first for the sae use ( I think moco or momo, or something like that is the name, is the frist one that pops up when you search, don't do it) so I bought this one and didn't expected much, but what a surprise this is the real deal, it works amazingly well and so fast, and it does it automatically. If you are reading this don't be like me, buy this one and save your regrets.