Exide MX78 Vehicle Battery

Exide Marathon Max MX78 Battery Overview

The Exide Marathon Max MX78 is a 12-volt vehicle battery built for applications that need strong starting power and steady reserve capacity. With 740 cold cranking amps, 925 cranking amps, and 115 minutes of reserve capacity, it supports dependable starts and electrical stability in demanding driving conditions.

Marathon Max is Exide’s battery line focused on higher starting output and practical reserve performance for trucks, vans, and full-size GM applications. The MX78 uses BCI Group Size 78 and terminal type S, making it a direct-spec option for many Chevrolet Express, GMC Savana, and related fitments.

Key Features

• 12-volt vehicle battery with BCI Group Size 78
• 740 cold cranking amps for strong starting performance
• 925 cranking amps for high initial output
• 60 amp hour capacity at the 20-hour rate
• 115 minutes of reserve capacity at 25 amps
• Terminal type S for listed vehicle applications
• Exide Marathon Max line, part number MX78

Detailed Product Description

The Exide MX78 is specified for a wide range of GM trucks, vans, SUVs, and performance applications where Group 78 battery dimensions and high starting output are required. It is listed for Chevrolet Express 2500 and 3500, GMC Savana 2500 and 3500, and earlier Express and Savana models, along with many Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, and Suburban applications. The fitment data also includes vehicles such as the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Saab 9-7x, and Dodge Viper.

For buyers searching for a replacement battery for a Chevrolet Express 2500 battery, GMC Savana 3500 battery, or a Group 78 battery for Silverado and Sierra trucks, MX78 provides the listed electrical specifications in one package. The part number MX78 appears across multiple OE-style replacement applications where higher CCA than the original battery is specified.

Common Problems This Battery Can Address

• Slow engine cranking in cold weather
• Weak starting performance after battery aging
• Voltage drop during accessory use with the engine off
• Replacement needs for Group 78 battery applications
• Battery failure in high-demand truck and van starting systems

Installation Notes and Fitment Tips

• Verify BCI Group Size 78 before installation.
• Confirm terminal type S matches the vehicle cable ends.
• Check polarity, tray clearance, and hold-down fit before mounting.
• Some listed applications note venting requirements or active cooling boxes; follow the vehicle-specific notes exactly.
• For 2007 Chevrolet Silverado 1500, 2007 GMC Sierra 1500, and similar early-production listings, confirm the OE battery specification before ordering.

Quality Assurance

Exide Marathon Max batteries are built to published electrical specifications for the listed applications. This MX78 battery is identified by its 740 CCA, 60 Ah capacity, and 115-minute reserve rating for straightforward specification matching during replacement.