Marine Batteries Shipped to Marathon, FL
Marathon is the boating hub of the Middle Keys, with Boot Key Harbor’s mooring field, Florida Bay to the north and Sombrero Reef to the south.
We don’t have a shop in Marathon. Marine Battery Source is an online store, and we ship to Marathon and the rest of Florida. Lithium batteries over $150 ship free by curbside truck freight to the lower 48. Chargers and accessories ship free when your cart reaches $150. Lead-acid and AGM batteries ship free by curbside truck freight too.
Boating around Marathon
Boot Key Harbor is one of the largest protected anchorages in the Keys, popular with cruising sailors and liveaboards. The Seven Mile Bridge runs west from Marathon, and its channels and the old bridge pilings are famous fishing spots. Florida Bay and the Gulf backcountry stretch north.
Typical boats around Marathon
Marathon anglers fish the reef for snapper and grouper, the bridges for tarpon in spring, and the Gulf humps for amberjack and permit. Cruisers in Boot Key Harbor need house banks sized for days at anchor.
Seasons and storage
Liveaboards on a mooring rely on solar and the engine to recharge, so lithium house banks that accept charge quickly are popular in Boot Key Harbor.
Hurricane prep is part of owning a boat in the Keys. Before a storm, charge everything fully and switch the batteries off, or pull small lithium batteries and store them indoors. A boat on a lift with a dead battery can’t run its bilge pump.
The Keys are hot, humid and salty all year, and a battery in a closed console can sit well above 100°F in summer. Sealed AGM or lithium batteries handle that better than flooded ones, and they won’t spill on a hard run across Hawk Channel. Rinse and coat terminals after every trip.
Battery types and sizes for Marathon
Twin-engine and offshore boats
Center consoles that run offshore from Marathon usually have one cranking battery per engine plus a house battery for electronics, pumps and lights. For cranking, a Group 27 or 31 AGM with high marine cranking amps is the common choice. A lithium dual-purpose battery like the EPOCH 172Ah can serve as a house battery and an emergency start, and it weighs a fraction of an equivalent AGM.
Bay boats, skiffs and shallow-water rigs
In Marathon, a typical inshore setup is a cranking battery for the outboard, two or three deep-cycle batteries for a 24V or 36V trolling motor, and an onboard charger to bring them all back overnight. Lithium is the popular upgrade because it holds full thrust until it is nearly empty and recharges quickly, but a good AGM deep-cycle battery is still a solid, lower-cost choice.
Motor yachts and trawlers
For large boats on Boot Key Harbor, house bank capacity is key. Match your bank to your inverter and charger, and replace all batteries in the bank at once.
Freight and delivery to FL
- Free lithium freight: lithium batteries over $150 ship free, curbside, to the lower 48.
- Parts and chargers: free shipping when your cart subtotal is $150 or more.
- Lead-acid and AGM: free curbside truck freight to the lower 48, the same as lithium.
- Scheduling: the carrier calls the delivery phone number you give at checkout to set a delivery window. An adult needs to be there to inspect and sign.
In-stock batteries for Marathon boats
All in stock now. Prices and stock update live on each product page.
- Interstate 31M-AGM 12V Group 31M AGM Dual Purpose Marine Battery – 925 CCA (12V 100Ah AGM, 925 CCA, Group 31M footprint)
- EPOCH 36V 50Ah Essential Series LiFePO4 Battery (1.92kWh) (36V 50Ah LiFePO4, Group 31 footprint, 35 lb, internal heating for cold charging)
- EPOCH 12V 460Ah Essential Series LiFePO4 Battery (5.89kWh) (12V 460Ah LiFePO4, Group 8D footprint, 84 lb, internal heating for cold charging)
- Interstate 27M-AGM 12V Group 27M AGM Dual Purpose Marine Battery – 850 CCA (12V 85Ah AGM, 850 CCA, Group 27M footprint)
- Interstate LI31M36V50 36V 50Ah Group 31M Lithium Marine Battery (36V 50Ah LiFePO4, Group 31M footprint)
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Interstate
Interstate 31M-AGM 12V Group 31M AGM Dual Purpose Marine Battery – 925 CCA
$459.95or 4 interest-free payments of $114.99
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EPOCH
EPOCH 36V 50Ah Essential Series LiFePO4 Battery (1.92kWh)
$749.00or 4 interest-free payments of $187.25
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EPOCH
EPOCH 12V 460Ah Essential Series LiFePO4 Battery (5.89kWh)
$1,599.00or 4 interest-free payments of $399.75
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Interstate
Interstate 27M-AGM 12V Group 27M AGM Dual Purpose Marine Battery – 850 CCA
$414.95or 4 interest-free payments of $103.74
FAQ
How do lead-acid batteries ship?
Lead-acid and AGM batteries ship free by curbside truck freight to the lower 48, the same as lithium.
Do you have a store or installer in Marathon?
No. We ship to Marathon from our store. Professional installation is a flat $99 per battery ($249 for a 24V or 36V lithium bank) anywhere from Venice to Gainesville, with no travel charge.
Who schedules the delivery?
The freight carrier calls the delivery phone number you enter at checkout to set up a delivery window. Someone needs to be there to inspect the shipment and sign.
Nearby locations
See every Florida location on our Florida shipping page, browse all shipping locations, or shop lithium, trolling motor, cranking and charger categories. Full terms are on our shipping policy.