Choosing the Right Battery for 115 Mercury Outboard

battery for 115 mercury outboard
battery for 115 mercury outboard


When it comes to enjoying your time out on the water with your trusty 115 Mercury outboard motor, having a reliable battery is crucial. Your battery powers not only the engine itself but also various onboard electronics, navigation systems, and other essential accessories. To ensure a seamless boating experience, it’s essential to choose the right battery for 115 Mercury outboard. In this article, we’ll walk you through the factors to consider and provide tips to help you find the perfect battery for your needs.

  1. Understanding Your Battery Needs

Before diving into the specifics of choosing a battery, it’s essential to understand your boat’s power requirements and how the battery works within your setup.

Your 115 Mercury outboard motor requires a 12-volt battery to start and run efficiently. Beyond powering the engine, you may have additional electrical needs, such as fish finders, GPS units, lights, and radios. Therefore, it’s crucial to consider both the cranking (starting) and deep cycle (house) aspects of your battery.

  1. Types of Marine Batteries

There are three primary types of marine batteries suitable for 115 Mercury outboard motors:

a. Starting Batteries: These batteries are designed for high cranking power to start the engine. They discharge a burst of energy quickly to get your motor running smoothly.

b. Deep Cycle Batteries: Deep cycle batteries are built to provide a steady, sustained amount of power over an extended period. They are ideal for powering onboard electronics and accessories.

c. Dual-Purpose Batteries: As the name suggests, dual-purpose batteries offer a balance between starting power and deep cycling capabilities. They are a versatile choice if you have limited space for multiple batteries.

  1. Battery Capacity (Ampere-Hour Rating)

The battery’s capacity, typically measured in ampere-hour (Ah) rating, indicates how long it can deliver power at a specific rate before needing recharging. To determine the right capacity for your 115 Mercury outboard, consider your boat’s power requirements. A higher Ah rating ensures longer-lasting power for accessories and electronics.

  1. Battery Maintenance

Proper battery maintenance is crucial for longevity and optimal performance. Ensure you:

a. Regularly check and clean the battery terminals to prevent corrosion.

b. Keep the battery charged using a marine battery charger, especially during off-season storage.

c. Store your battery in a cool, dry place and protect it from extreme temperatures.

  1. Battery Brands and Quality

Invest in a reputable battery brand known for its durability and reliability. Some well-regarded brands in the marine battery industry include Optima, Interstate, and Exide. Reading customer reviews and seeking recommendations from fellow boaters can help you make an informed decision.

  1. Consider the Battery’s Size and Fit

Ensure the battery you choose fits your boat’s battery compartment and can be securely fastened. Measure the available space and cross-reference it with the dimensions of the battery to avoid any installation issues.


Selecting the right battery for your 115 Mercury outboard motor is essential for a trouble-free and enjoyable boating experience. Consider your power needs, the type of battery, its capacity, maintenance requirements, and brand reputation when making your decision. By doing so, you can ensure that your boat’s engine starts reliably, and your onboard electronics and accessories operate smoothly, making every trip out on the water a memorable one.

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