2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 18Get this manual
SERVICE SPECIFICATIONS AND SPECIAL TOOLS TECHNICAL DATA HP
12-Volt, 360 CCA (465 MCA) with 90 Minutes Reserve Capacity or 50 Ampere-Hour PIN 5031911 15 Amperes Auto Pressure-Temperature Controlled 143F (62C) Magneto Powered Capacitor Discharge 6300
Battery, Minimum Recommendation Engine Fuse (25 Amp) Charge Coil Output Type