For a 2 stroke model, a 500 to 650 cca, 12 volt starting battery will be sufficient. The recommended battery for a four stroke model is 1000 cca,
Mercury 1984 6 cylinder L6 what type & size of starting battery is required
550 cca
For a 2003 115hp 4-stroke Mercury outboard, a marine starting battery with a minimum of 650 CCA (Cold Cranking Amps) is typically recommended. A group size of 24 or 27 is often suitable, but it's important to check the owner's manual for specific recommendations based on your outboard's requirements. Additionally, ensure the battery is designed for marine use to withstand the harsh conditions.
The 75 hp Mercury outboard will need a starting battery in the 650 CCA range, although, up to 1000 CCA would work just fine.
Any place that sells batteries can tell you the correct size to buy.
For a 2006 115hp Mercury outboard, a Group 24 or Group 27 marine battery is typically recommended. These batteries provide sufficient cranking amps and reserve capacity for the outboard's starting and operational needs. Ensure the battery is a deep-cycle or dual-purpose type for optimal performance. Always check the owner's manual for specific requirements or recommendations.
For a 2005, Mercury 3.3 hp outboard, a NGK BPR6HS.
Mercury wants you to install a battery with at least 525 marine cranking amps if you boat in the summer, and 1000 marine cranking amps for winter boaters.
1 gauge cable should do the job
OD281588
For a 150 hp Mercury outboard, a 12V battery with a minimum capacity of 800 CCA (cold cranking amps) is typically recommended. A group size 27 or 31 battery is often suitable, as they provide adequate power for starting and running the motor. It's also advisable to consider a deep-cycle or dual-purpose battery to support additional electrical systems on board. Always check the manufacturer's specifications for the most accurate recommendations.