What size battery for a 150 hp Johnson 2 cycle engine?

For a 150 hp Johnson 2-cycle engine, a recommended battery size is typically a Group 24 or Group 27 deep cycle battery, with a minimum of 600 CCA (cold cranking amps) to ensure reliable starts. It's important to check the engine's specific requirements, as some may also recommend a higher capacity depending on the electrical accessories in use. Always ensure the battery is compatible with the engine's electrical system for optimal performance.