I am fortunate enough to maintain two houses - one in the mid-West for the summer and a second one in the Palm Springs area for the winter. Rather than drive 1500 miles each way I have a couple of cars in each location so each set will sit idle for six months of the year which means I usually have two dead batteries when I arrive for the season. I tried a cheaper brand of trickle charger in the desert last year and it worked but I was afraid that if it burned out I would still return to dead batteries. I really like the quality of the Schumacher products having two of their multifunction battery chargers that have worked well for over 10 years. When I saw that they offered high quality trickle chargers I bought two of them to make the switch to worry free charging. The chargers are well built and heavy for their size and the build quality is typical Schumacher. The chargers are intended to be installed in the engine compartment with battery connections that are permanently connected to the charger and for power a short plug comes out of the side of the unit and is easily connected to a grounded extension cord. I really didn't want to install these under the hood even though they supply the mounting brackets and screws required but I did like the idea of the permanent connection to the battery as opposed to a clamp which could fall off in the middle of the season and leave me with a dead battery. Remembering how the chargers connected in the Power Wheels toys my sons had several years ago, I was able to find polarity keyed plug connectors in the trailer wiring section of the local auto parts store and now have a short  pigtail permanently connected to the battery and the ability to plug and unplug it into the charger when I want. Now I have the best of all worlds, the security of a solid connection to the battery and the flexibility of being able to plug and unplug the charger with ease. I like this a lot.