hey fellas just a quick question for you about my battery set up. i currently have a century 400 marine pro that i just bought for my 4.2 m tinny that runs nav lts anchor lt 12 v outlet ,bilge pump and my sounder. the guy i bought the boat off is also giving me a tiller steer minkota that he got with it but never used i think its around the 50lb thrust. my question is can i run this off my 400 size battery or do i need a seperate battery? ive noticed everyone with electric motors have a seperate battery. why is this? i have an alternator kit on the motor so it recharges as i run the motor,with the motor being a pull start i dont need battery power to start it if the battery did go flat. any help would be good . cheers nick