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AGM & Lead-Acid

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Lead-acid batteries have powered boats for generations, and for many boaters they’re still the practical choice. They cost less upfront than lithium, they work with almost any existing charger and alternator, and they’re available in every common size. Today’s marine lead-acid batteries come in three main types, and AGM marine batteries are the most popular upgrade. Flooded batteries are the traditional, serviceable design. AGM (absorbed glass mat) batteries are sealed and spill-proof, and they need no watering. EFB (enhanced flooded) batteries sit between the two.

This collection includes deep-cycle, starting and dual-purpose lead-acid batteries from Trojan and Interstate. You’ll find 12V marine batteries in Group 24, 27, 31, 34 and 4D/8D sizes, plus Trojan’s 6V deep-cycle batteries, including AES AGM models, for building heavy-duty 12V and 24V house and trolling banks.

Each product page lists the manufacturer’s specs, including CCA or MCA where they apply, along with dimensions and weight. Prices and stock are confirmed in your cart. We ship nationwide and install anywhere from Venice to Gainesville, FL, including help choosing between AGM, flooded and lithium.

Voltage:6V12V24V36V48V

AGM vs flooded vs EFB

Flooded lead-acid

Flooded batteries have liquid electrolyte that you can inspect and top up with distilled water. They’re economical and forgiving, and they’re widely used for deep-cycle house and trolling banks, especially as 6V pairs. They need to be mounted upright in a ventilated space, because they release gas while charging. Plan on checking the water levels regularly.

AGM

AGM batteries hold their electrolyte in glass-mat separators, so they’re sealed, spill-proof and need no watering. They tolerate vibration well and can often be mounted in more positions; check the manufacturer’s guidance. They usually cost more than flooded batteries, and they’re sensitive to over-charging, so use a charger with a proper AGM profile.

EFB

Enhanced flooded batteries add design improvements for better cycling durability than standard flooded batteries, at a lower cost than AGM.

For a hands-on comparison, read AGM vs flooded maintenance.

Pick the right type for the job

  • Starting: look for a CCA or MCA rating that meets your engine maker’s requirement. Shop Cranking.
  • Dual purpose: one battery that starts the engine and runs accessories. Shop Dual Purpose.
  • Deep cycle: for trolling motors and house loads. Shop Trolling Motor and House Bank.

Size, terminals and charging

Match the BCI group size to your tray or box, and check terminal type and position. Our BCI group size guide explains codes like 24M, 27M and 31M. Set your charger to the correct profile for the battery type. Flooded, AGM and lithium each charge differently, and a wrong profile shortens battery life. You’ll find compatible chargers in Chargers.

Making lead-acid last

  • Recharge promptly after use. Lead-acid batteries left partially discharged develop sulfation.
  • Avoid deep discharges where you can; shallower cycles mean longer life.
  • Keep terminals clean and tight, and protect them from salt spray. See saltwater corrosion prevention.
  • Keep batteries cool and ventilated. Heat is hard on lead-acid; read Florida heat and battery life.
  • Maintain them during storage. See the winter storage guide.

AGM marine batteries and lead-acid FAQ

Can I replace a flooded battery with an AGM?

Usually, yes, if the size and terminals fit. Set your charger, and any adjustable charging source, to the AGM profile.

Can I mix AGM and flooded batteries in one bank?

No. Batteries in a bank should be the same type, model and age.

Why do some trolling banks use 6V batteries?

Two 6V deep-cycle batteries in series make 12V. Many boaters choose them for their heavy-duty deep-cycle construction where space allows.

Should I switch to lithium instead?

It depends on your budget, weight goals and how much you cycle the battery. Compare our Lithium collection, or ask us.

Prices, stock and shipping options are confirmed in your cart and at checkout.

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