GENIUS2X4: 8A 4-Bank Smart Battery Charger (2A/Bank) - 6V/12V Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium

What a great product. We use this for our "not so often used vehicles" in our garage. We had the issue of our vehicles not being ready to drive when we wanted to take them out for a weekend spin or up to a local car show due to drained batteries. This eliminates the issue by maintaining a full charge. The multiple ports are awesome and the extension cables make routing a breeze. The size and compact design make it look great and a nice addition to our garage. I also use it for our other lawn, atv and other batteries. Simply connect and it's intelligent system detects the battery type, size and charging needs. Shuts off automatically and will turn back on if it detects a voltage drop. Love this thing!

I bought this in November 2023 and I can say this thing is absolutely amazing!!!! I plugged it in the day it showed up and it has been used every single day since then, currently 1-23-26. I had an optima yellow top that was ran completely dead last winter and sat outdoors in my broken down truck for 2 months of winter. I thought for sure it was going to be ruined because it was literally frozen when I brought it in, but this charger literally brought it back to life and the battery is still alive today. I also have both my motorcycles and a spare battery hooked up to this 100% of the time they’re not being used and it keeps them perfectly charged. Don’t hesitate buying this, I promise you won’t regret it. Buy it, plug it in, hook it up to your battery and forget about it because this charger automatically does everything on its own.

Working great for a couple months now. Loaded up the last bay of the barn with the RZR, both quads and the mower.

Great charger

Super nice to be able to keep four batteries charged at the same time

This is a really nice charger. Each bank has its own power button and battery selector. So you can charge different batteries at with the same charger. The ONLY reason I didnt give it 5 stars is because it only came with alligator clips. Its an on board charger and should have come with pretty wired pigtails to mount to each battery. It does come with several different power cords, so if youre buying this from outside the USA, you wont need to purchase a separate adapter

Full disclosure, we use other Noco chargers onboard our school buses at our kid's school. They are very robust and keep the dual 12V commercial batteries fresh when the buses are not in use. I got this one for my motorcycle fleet(?) at home. Yes, the charger is more expensive than several similar. It's worth it. I've used Battery Tenders, and many others over the years. The Noco is best. The leads for the battery are not the standard SAE version. Noco uses a heavier duty connection that clicks into place. The alligator clips are designed to be removed if you need to permanently install a lead on your vehicle's battery inside your car. The unit comes with clear instructions. If you are upgrading for an existing SAE configuration, get the Noco-SAE adapter ($16 at this time). Just search in Amazon "NOCO GC009 X-Connect SAE Adapter Accessory Genius Smart Battery Chargers" .

We bought an El Debo electric pontoon boat this year, and were concerned over the four marine batteries age and condition as we nervously ran the boat to the public landing with the needle gage dropping as we watched. In four days, after removing them to the garage and hooking them up to this newly arrived marvel, two read out as good from the start, and two have miraculously recovered a full charge after indicating serious trouble. I wonder what Spring will bring?