I have a question about Marine batteries; I have a Yamaha 225, 2-Stroke Outboard engine, the only thing I run while fishing is the Lowrance, HDI 7. The boat came with a Group Size 27 battery (Walmart) I have the opportunity to get a new Blue Top Optima, for $116.00, however it's a Group 34 Size. Question is can I switch to a battery that size and still be ok?