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

Bought the NOCO GENIUS5 to keep my car battery from dying during the weeks it sits unused. Setting it up was straightforward, just hooked up the clamps, plugged it in, and let it do its thing. It figures out the voltage on its own which is nice if you aren't sure what you're working with. The unit feels really solid and compact compared to older chargers I've used. It doesn't take up much space in the garage. I like that I can just leave it connected without worrying about overcharging since it switches to maintenance mode automatically. Only downside is the cables could be a bit longer. Had to use an extension cord to reach the outlet from where my car is parked. Also, the display is kind of small, so reading the status from across the garage isn't happening. Works as advertised though. Battery starts up strong even after sitting for a while. Glad I finally picked one of these up.

I’ve been using the NOCO GENIUS5 5A 6V/12V Smart Charger daily in my car tuning and workshop business, and it’s been fantastic. I’ve tested multiple brands before, but this charger stands out for its reliability, speed, and safety features. It charges a wide range of batteries — from small cars to larger vehicles — quickly and efficiently. The smart charging technology ensures it automatically adjusts to the battery type and condition, giving me peace of mind that I’m charging safely without risking any electronics or overcharging. I use it on customer vehicles, tuning projects, and even on performance cars after testing, and it performs flawlessly every time. The compact design is easy to store, the display is clear, and it’s simple to operate, even in a busy workshop environment. For any automotive professional or tuning enthusiast, the NOCO GENIUS5 is a must-have. Powerful, dependable, and incredibly smart — it’s a tool I can rely on every single day. Highly recommend!

Revivied, restored and charged my motorcycle battery in a few hours and brought it back to tip top performance! Good quality product well made and really good strong sturdy clamps included , simple to use and desulfurization mode worked a treat and cycled through quick enough and charged my battery back to full now after being left out for a month or more in freezing cold storage . Well worth buying and having in the garage

This is one of those items that once you have it you wonder why you didn't buy it sooner. Particularly when I needed to call out roadside assistance during a period of cold weather this Winter as there was a battery issue with our hybrid car. Fortunately it was nothing major and didn't take long for the technician to get it going again, but we chatted and he suggested getting a charger as a preventative measure. Mainly as the battery on many hybrid cars will lose it's charge if they don't do sufficient miles or when parked for a long length of time. Several options were mention, this being one of them. It certainly does the top up, charging and other recovery jobs very effectively and came highly recommended, also at an affordable price. Functionality is very straight forward although there isn't a hand book or other instructions in the packaging which is possibly the only negative I will mention. Other than that it's fairly intuitive, compact and didn't get hot during use. Well worth putting among a list of potential buys if you are looking for such a device.

I bought this NOCO battery charger to replace an ageing battery charger, and I needed a charger that would be suitable for the newer AGM/ Stop start batteries. Initially I had been given advice to purchase a well known competitor to the NOCO, but as I already own, and highly rate the NOCO jump starter/booster pack, I decided that I would stick with the brand. From the moment you open the box, it's clear to see that NOCO take time and effort to design and manufacture their products. The products are so well made, which make it a refreshing change from all of the usual cheaply produced rubbish that you see. The charger is a sturdy bit of kit and feels it. The battery lead come in two pieces - which is a brilliant idea. It makes it so much easier to attach the battery clamps to the battery, without worrying about the charger banging around behind. Especially as is often the case these days, the batteries can often be buried in the car somewhere. Talking of the battery clamps, they are a perfect size, not too big or too small, and the clamping pressure is spot on. The other advantage of the lead being in two is that you could permanently attach the clamp end to your battery terminals (obviously using the ring terminals instead of the clamps) and then leave the lead permanently attached to the car. It's simply a case then of attaching the other end (with the charger attached) to the lead - perfect if you want to regularly top up your battery. The end you leave on the car has a well made cover that simply attaches over the end and keeps it clean and dry, and the connection between the two leads is well constructed. On to the charger. It's so easy to use. Connect it all up to the battery and turn the mains on. The charger instantly goes on to standby, something that most battery chargers don't do, and I for one think it's an excellent safety feature. Simply press the button to select your battery type and leave it to do its job - it's that simple. The led's are nice and bright and show clearly the charging process of the battery. This is an excellent product and there are many reviews online for you to view before taking my word for it. Well done NOCO, another excellent product!

The NOCO Genius5 is a significant step up from the previous G3500 model. It is smaller, smarter, and incredibly powerful for its size. I’ve used it on both my daily driver and a motorcycle battery that had been sitting idle, and the results have been flawless. 1. Smart Charging and Versatility: What makes the Genius5 stand out is its ability to handle 6V and 12V batteries, including Lead-Acid, AGM, and Lithium-ion (LiFePO4). The "Force Mode" is a standout feature; it allows you to manually start charging batteries that have dropped to 0V, which most smart chargers would simply reject as "dead." 2. Battery Repair and Desulfation: I tested the Repair Mode on an older AGM battery that was struggling to hold a charge. The integrated thermal sensor is a great addition, as it adjusts the charging profile based on the ambient temperature to prevent overcharging in summer or undercharging in winter. After a full cycle, the battery's health significantly improved, saving me from a costly replacement. 3. Safety and Ease of Use: The "plug-and-play" nature of this device is excellent. Once connected, it monitors the battery 24/7 without any risk of overcharging. The clamps (X-Connect) are high-quality, with a needle-nose design that makes them easy to attach to smaller motorcycle terminals or cluttered car battery bays. Pros: Extremely compact and lightweight compared to traditional chargers. Supports a wide range of battery types, including Lithium. "Force Mode" can revive batteries from 0 volts. Intelligent temperature compensation for all-season charging. Cons: The interface is simple, but you must read the manual to understand the different light patterns for the Repair mode. The cables are of good quality, but they can be a bit stiff in very cold temperatures. Final Verdict: Whether you need to maintain a seasonal vehicle or try to rescue a discharged battery, the NOCO Genius5 is a professional-grade tool that is remarkably easy to use. It’s an essential piece of kit for any garage.

Very nice piece of kit, easy to use and very capable. Other comments highlighted a lack of a user guide, but a PDF version is easy to find by searching online.

This is without doubt a fantastic bit of kit. My battery was completely dead, zero charge. Been away and vehicle not used fir 3 months. Charged fully for 24 hours and car started first time! Highly recommend this great little power puncher!!