These days we have so much going on that draws power from our batteries. Especially on our charter fishing boats where we have electronics, bait pumps, aerators, power poles, lights and jack plates just to name the basics. Then add a monster stereo to the mix and you are pulling some serious AMPS that will crush any large 12 volt house battery. Often this need is met with another battery (more weight) or not sitting as long to catch the fish. Regardless this need has been met by the Massive 150 amp alternator on the 400R. A massive amount of energy being put back to the batteries by just running the motor. Using the Relion Lithium Ion batteries for my start and house battery needs they are able to take more Charge amps than typical AGMs. This allows the 150 Amp alternator to put the juice back in my batteries quickly keeping me lit throughout the day..