The Noco Genius 2 Smart Charger has an 80% 5-star rating on Amazon. I recently bought one to keep the battery on my Chevy SUV charged. I made the mistake last year of letting the vehicle sit in the garage for too long without driving it. When winter came around, the battery refused to hold a charge. I decided to get a trickle charger to make sure that didn't happen again this year. The Noco Genius 2 does that and more. It is designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries. An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging. It charges batteries as low as 1-volt. It automatically detects battery sulfation and acid stratification to restore lost battery performance. It's not just a trickle charger, it's an advanced battery maintainer.
As of this date, the Noco Genius 2 is on sale on Amazon for $49.94. I got mine in like-new condition from the Amazon Warehouse for $42.94. The unit measures 3.7 x 2.4 x 1.7 inches and weighs under 1 lb. It comes with a 56" cable plus 21" detachable cable with battery clamps. The clamps can be removed, and eye rings can be attached directly to the battery if needed. The charger is made of plastic but has a solid feel. The default operating mode is for a 12 volt lead acid battery, so there is no need to adjust settings. The charger automatically goes into a conditioning cycle. Initially, when I attached it to my SUV battery, it took a few hours before the large green light came on indicating that it was in trickle charge mode. I drove the vehicle the other day and the battery was nice and strong. I reattached the charger and this time the green light came on after only a few minutes.
I have only had the charger for a few weeks, but so far it is working well. Just like anything electronic, these things eventually stop working. But this feels like a well-built device and the company has several other models based on the same design. This is a good option if you want to maintain a battery in a vehicle that doesn't get used much. There is nothing more frustrating than trying to start your vehicle with a weak battery. A new battery can cost over $200. With gas prices over $4 per gallon, I have cut back on driving. Other things like tires, belts and hoses can deteriorate if you let a vehicle sit too long. This will hopefully be one less thing to worry about.
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