NOCO GENIUS5: 5A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – For Lead-Acid & Lithium Batteries

I purchased this NOCO battery charger to maintain the battery in my 2000 Ford Ranger, which isn't driven very often. I ran the battery fixer mode, and now it's automatically in maintenance mode, and it's working perfectly. My truck starts right up every time.The alligator clip clamps were easy to attach to my battery terminals, and the cord's locking mechanism ensures a secure connection. The unit operates silently, with no noticeable noise. The indicator lights are intuitive, going from red to green to clearly show the charging status. The instructions provide detailed information about the indicators and modes, though I primarily use the maintenance mode. The charger itself is compact and easy to store.This NOCO charger is packed with safety features. It tapers the charge to prevent overcharging, and the cord's design prevents reverse polarity issues. The instructions also mention that it protects against problems if you accidentally connect the clamps to the wrong terminals.While not the cheapest option, NOCO has a solid reputation, and in my experience, this charger performs exactly as intended. It's a reliable and effective way to maintain a vehicle that isn't driven regularly, providing peace of mind and ensuring my truck is always ready to go.

I’ve been using the NOCO GENIUS5 for a few months now, and it has far exceeded my expectations. This charger is compact and lightweight, but don’t let the size fool you—it’s incredibly powerful and packed with smart features.What I love most is how effortless it is to use. It automatically detects the battery condition and applies the right charge—no guesswork involved. Whether I’m charging my car, motorcycle, or even maintaining a boat battery, it handles everything smoothly.The “Repair Mode” is a game-changer. I was able to revive an old battery I thought was dead! It also supports lithium and AGM batteries, making it versatile for any vehicle.If you need a reliable, smart, and safe battery charger that does more than just charge—this is it. Definitely worth every penny.

I had a prior trickle charger that just up and stopped working. By the time I realized it, the car battery was dead. Like totally dead. Well, I researched products to restore the battery and recharge it and decided to purchase this one. I followed the instructions on plugging it in, but with a dead battery, I kept my hopes in check. Well, the product lived up to its hype - in less than 1 day my battery was back to full charge and the car cracked over first try! I have it connected now since we don't drive that car very often and this is a smart trickle charger so I feel like it will maintain the battery better. Easy to use and definitely built in safety. The status lights are great too. Definitely worth the money. Would buy again.

Great compact Battery Charger. When I saw the size, I wasn't sure i had made the right choice, but it is really a great little Charger for my 2019 Lincoln MKC. Easy to use, the Clamps are the right size for any Auto/Motorcycle/Marine Battery. Very good quality. It charged my Battery, left it on for 3 or 4 hours but had to disconnect because of thunderstorms moved in. Verified the charge by opening the rear gate, electronic start, and electric door opener. However, the MKC didn't hold the charge overnight. Battery is over 3 years old. A neighbor had previously charged it with his big charger and we thought maybe hadn't charged long enough but after using this one also, we're going to get a new battery. Would buy this again. Highly recommend.

I was delighted when I realized the product weight indicated a real transformer and not a switch mode power supply. The wiring feels robust. The battery clams have a wide bite, wonderful for those large battery posts on the auto restart cars.One of the pictures shows what all came in the box. I was interested in the wall mount and no seller offered a photograph. The unit snaps into the mount and is held in place by Velcro.The biggest negative is the waterproof proprietary two prong connector. This is a locking waterproof connector. The last thing I want on a float charge is a locking connector to rip the wires out and the device off the wall if I forget (and I have) to unplug before leaving the garage. In addition this connector is not compatible with any other SAE 2-prong connectors you may have in house. I will be cutting off the stock connectors and replacing with standard SAE for safety reasons. I will report back when I measure the wire gauge.Lastly, when I plug the charger into the car only one indicator light on the charger comes on telling me the battery is ¼ charged. I measured battery voltage at 12.55 volts which is actually about 80-90%. The instruction manual only offers basic instructions.Packaging, it is well packaged make room in the recycling can.Update: 4APR25, wire conductor appear to be aluminum wire, appears close to 16 gauge, the battery clamps are wonderful, wide bite. Notice when returning a AGM automobile battery back to charge, the charger initially indicates battery level at 1/4 charge. Actually batter measured 12.6v closer to 90%. In about 15 minutes the charger catches up.

This little charger is a good bang for your buck. I'm using it on my 2025 Chevy Traverse with an AGM battery to keep the battery charge topped off while in the garage. The unit does get hot to the touch which was concerning to me but once it charges the battery it floats a 13.25-volt charge to maintain the battery. I've had the unit for about a week with no problems it had my battery up and charged in about 6 hours.Note: I contacted the company via email about my heat concern, and they said it was normal to just keep it of carpet or anything that may impede air flow for cooling. Customer Service was excellent I had an email reply in a few hours, and it was on a Saturday afternoon.