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Interstate

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Interstate is one of the most recognized battery brands in the country, and its marine line covers every common job on a boat. Whether you need a reliable starting battery for an outboard, a dual-purpose battery for a boat with one battery bay, or deep-cycle power for a trolling motor, Interstate marine batteries come in the familiar group sizes that fit most battery boxes and trays.

The Interstate collection here includes flooded marine starting batteries and flooded deep-cycle and dual-purpose batteries in Group 24M, 27M, 31M and 4DM sizes. There are AGM dual-purpose batteries in Group 24M, 27M, 31M and 34M that are sealed, spill-proof and maintenance-free, and EFB (enhanced flooded) deep-cycle batteries. You’ll also find Interstate’s lithium marine batteries: 12V Group 24M and 27M models, plus native 24V and 36V batteries in a Group 31M case for trolling motors.

Each product page lists Interstate’s published ratings, including CCA and MCA where they apply, along with capacity, group size and warranty details. We ship nationwide and install anywhere from Venice to Gainesville, FL.

Voltage:6V12V24V36V48V

Choosing Interstate marine batteries

Starting batteries

Interstate’s marine starting batteries are built for engine cranking. Pick one that meets or exceeds your engine maker’s CCA or MCA requirement, in a group size that fits your tray. Shop Cranking, and see our guide to BCI group sizes for what 24M, 27M and 31M mean.

Dual purpose

Interstate’s AGM and flooded dual-purpose batteries start the engine and run accessories. They’re a strong fit for boats with one battery, or two batteries on a switch. AGM versions are sealed and maintenance-free. Compare options in Dual Purpose.

Deep cycle and trolling

For trolling motors and house loads, choose a deep-cycle flooded or EFB battery, or go lithium. Interstate’s native 24V and 36V lithium batteries replace two or three 12V batteries in a single Group 31M case, which simplifies wiring and saves weight. See Trolling Motor and choosing a trolling motor battery.

AGM, EFB, flooded or lithium?

  • Flooded: economical and proven. It needs ventilation and periodic watering.
  • EFB: an enhanced flooded design with improved cycling durability.
  • AGM: sealed, spill-proof and vibration-resistant, with no watering needed.
  • Lithium: much lighter, with deep usable capacity and steady voltage. It needs a lithium-compatible charger.

Read AGM vs flooded maintenance for upkeep differences, and converting a boat to lithium if you’re considering a switch.

Warranty and ratings

Interstate publishes warranty terms by model, and they vary across the line. You’ll find the details for each battery on its product page. Ratings like CCA, MCA and amp-hours come from Interstate’s published specs.

Charging

Match your charger’s profile to the battery type: flooded, AGM or lithium. Using the wrong profile shortens battery life. Shop compatible Chargers.

Replacing an existing battery

The easiest way to choose a replacement is to start from the battery you have. Note its group size, its CCA or MCA rating, its terminal type and which way the terminals face, and whether it’s flooded, AGM or lithium. Then compare those details with the listings here. If you’re changing chemistry or moving to a larger case, measure the tray and check your cable lengths before you order.

Interstate marine battery FAQ

What does the “M” in 24M or 27M mean?

It denotes a marine version of that BCI group size. Always check the listed dimensions and terminals against your tray and cables.

Can I upgrade from a flooded Interstate battery to AGM?

Usually, yes, if the group size fits. Set your charger to the AGM profile.

Are Interstate lithium batteries good for trolling motors?

Yes. The 24V and 36V lithium models are designed for that job. Pair them with a matching lithium charger.

Do you install Interstate batteries?

Yes, anywhere from Venice to Gainesville, FL. See local installation.

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