I'm new, so I'm sorry if this is a silly question, but does my Evi 120 HP actually charge the battery while the engine is running, like a car? I'm wondering how the electronics stay powered on the boat and don't want to over load the battery. It currently has all gauges, power T&T, and I'm adding a Lowrance Depth/Fish finder. I want to also add a am/fm cd and vhf marine radio, but don't want to kill my battery. <br /><br />Thanks for any info or links.<br /><br />Rick