Need a new starter battery for my 04 classic. Out yesterday and my electronics (2) quit working about half way through the day. Put battery on charger when I got home and locators turned on. The last couple of times I went out fishing the locator on bow would turn off when I fired up the big motor. Right now I have an Interstate battery (not sure on size). What size and brand would you guys recommend? Also should I get a starter battery or a dual purpose one?