I've had mostly "dumb" car chargers over the years, and they serve a purpose, but their usefulness is limited. Lately I've been using a 6 amp RC hobby charger, but it's not really suitable for this application. After my wife's car battery died after two weeks of inactivity and my batteries were starting to run out, I decided to invest in a long-term solution. Modules in the footwell when jumping or loading. CTEK has a soft start and several safeguards designed to minimize this risk. Unlike a battery conditioner that doesn't have the amperage to charge the battery, this one has 7 full amps of power to get the job done. Two of my cars have Optima Red Tops batteries installed and have had no trouble charging them, although I had to run them twice before it fully charged my Mustang and went into service mode. Now I charge all my cars once every two weeks to recharge the battery. I leave it attached to my Mustang which is in the garage. I'm a bit surprised that the 7 amp charger doesn't require a fan, but I've never felt it get hotter than just a little bit. It's as easy to use as it gets. You connect the cables to the battery and turn on the charger. There are four different settings and it remembers your last setting. They say Red Tops love winter mode so I'll dump them. There are three status LEDs followed by maintenance mode when the battery is fully charged. The only thing I can't rate is the durability, but I like the charger so far.