Here’s my 3rd battery system. Sears was having a sale and I got this AGM Diehard for $120. This battery will be used both for the boat and the SUV when camping. I can “plug” into the electrical system via Male-to-Male cigarette adapter cable or high amp plug shown. The boat and the truck have both types of plugs. It has a 150 watt inverter to run the netbook, tablet, wifi, and the cell phone charger. It is nice not to have to run the engine and not be worried about running down the batteries. To recharge it, I just plug it in the cigarette adapter when the engine is running.