Why not a car battery on my boat?

Standard car batteries (SLI thin plates) deliver high CCA briefly and recharge from the alternator. In marine use, discharges are long and deep — destroying SLI in weeks. You need marine AGM (thicker plates) or deep cycle.

Will a dual battery work for engine + cabin?

Only on small boats (<6 m) with modest loads. As soon as equipment grows (fridge, plotter, autopilot), split banks: starter (50-80 Ah AGM) + service (100-200 Ah deep cycle AGM).

For occasional weekend use, no. For liveaboard or long cruises, yes: weight savings and 100% usable capacity (vs 50% lead) pay back in 3-4 years.

Free 14-day returns for mainland Spain and Portugal if sealed.

How long does shipping take?

Standard delivery 1 to 5 working days to your country. We process orders within 24h.

Verified customer reviews about baterias.com on Trustpilot.

Boat batteries: starting, house and dual purpose

Q: Is lithium worth it?

For occasional weekend use, no. For liveaboard or long cruises, yes: weight savings and 100% usable capacity (vs 50% lead) pay back in 3-4 years.

Q: Returns?

Free 14-day returns for mainland Spain and Portugal if sealed.

Q: How long does shipping take?

Standard delivery 1 to 5 working days to your country. We process orders within 24h.

Find the battery for your boat using the finder right below: select your vehicle step by step and see only 100% compatible batteries.

Other quick paths: by number plate, by part-number from the manufacturer or by the code printed on your current battery (Varta E11, Tudor TC700, YTX12-BS, etc.).

Subcategories

Marine Dual Purpose Batteries

Choose right in 3 questions

Starting or house?

Starting for the engine; deep-cycle house battery for fridge, lights and electronics; dual purpose if only one fits.

Starting vs house · Dual Purpose

AGM, gel or lithium?

Sealed AGM is the safe choice on board; LiFePO4 lithium weighs half and lasts many more cycles.

Fullriver AGM · LiFePO4 lithium

How many Ah?

Add up your daily consumption in Ah and double it so you never discharge below 50%.

How to size the bank

Batteries for other vehicles:

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Boat battery finder

Looking for the exact battery for your boat? We guide you in 3 clicks to the right reference, with full technical data and live prices. Over 25 years specialising in batteries for cars, motorcycles, trucks, boats, caravans and industrial machinery.

How we find the right battery for your vehicle

Pick your vehicle brand below.
Select model, engine and year in the next screens.
Compare and buy with 24h delivery.

What you will see on every compatible battery

Manufacturer reference: the one fitted at the factory.
Capacity (Ah), cold-cranking amps (CCA), dimensions and positive terminal.
Leading market brands: Varta, Tudor and Exide.
Express 24h delivery for same-day battery replacement.

Every battery is compatible with the manufacturer specifications and audited by our in-house technical team. Start by picking your vehicle brand below.

Top 10 best-selling batteries

Marine battery Exide EP800 12V 95Ah 850A AGM€133.30View

Caravan battery Optima YTS-5.5 12V 75Ah 975A AGM€261.10View

Marine battery Exide EP450 12V 50Ah 750A AGM€141.80View

Marine battery Optima BTDC-5.5 12V 75Ah 975A AGM€263.70View

Marine battery Exide EP600 12V 70Ah 760A AGM€104.70View

Marine battery Exide EU80-6 6V 80Ah 600A€102.50View

Marine battery Exide ER450 12V 95Ah 720A€89.50View

Marine battery Varta LA95 12V 85Ah AGM€182.40View

Marine battery Exide EP900 12V 100Ah 800A AGM€245.95View

Marine battery Varta LA80 12V 77Ah AGM€154.80View

There are 310 products.

Sort by:

Showing 1-18 of 310 item(s)

On sale!

OPTIMA

Caravan battery Optima YTS-5.5 12V 75Ah 975A AGM

12V

75Ah

975A

325 × 165 × 238 mm

4,71(85)

€261.10 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP800 12V 95Ah 850A AGM

12V

95Ah

850A

AGM

353 × 175 × 190 mm

4,79(66)

€133.30 VAT incl.

TO BUY

VARTA

Marine battery Varta LA95 12V 85Ah AGM

12V

850

AGM

353 × 175 × 190 mm

4,70(60)

€182.40 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP600 12V 70Ah 760A AGM

12V

70Ah

760A

AGM

278 × 175 × 190 mm

4,78(51)

€104.70 VAT incl.

TO BUY

EXIDE

Marine battery Exide EU80-6 6V 80Ah 600A

80Ah

600A

158 × 165 × 220 mm

4,78(35)

€102.50 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTDC-5.5 12V 75Ah 975A AGM

12V

75Ah

975A

325 × 165 × 238 mm

4,80(36)

€263.70 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP1200 12V 140Ah 700A AGM

12V

140Ah

700A

AGM

513 × 189 × 223 mm

4,79(52)

€269.80 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP450 12V 50Ah 750A AGM

12V

50Ah

750A

AGM

260 × 173 × 206 mm

4,77(29)

€141.80 VAT incl.

TO BUY

VARTA

Marine battery Varta LA80 12V 77Ah AGM

12V

80Ah

800A

AGM

315 × 175 × 190 mm

4,79(34)

€154.80 VAT incl.

TO BUY

VARTA

Marine battery Varta LFD140 12V 119Ah

12V

140

800

513 × 189 × 223 mm

4,79(41)

€181.40 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER550 12V 115Ah 760A

12V

115Ah

760A

349 × 175 × 235 mm

4,80(40)

€123.30 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTDC-4.2 12V 55Ah 765A AGM

12V

55Ah

765A

254 × 175 × 200 mm

4,80(36)

€216.90 VAT incl.

TO BUY

OPTIMA

Caravan battery Optima YTS-4.2 12V 55Ah 765A AGM

12V

55Ah

765A

254 × 175 × 200 mm

4,81(36)

€213.80 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER350 12V 80Ah 570A

12V

80Ah

570A

270 × 173 × 222 mm

4,79(34)

€85.20 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP900 12V 100Ah 800A AGM

12V

100Ah

800A

AGM

330 × 173 × 240 mm

4,82(29)

€245.95 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER450 12V 95Ah 720A

12V

95Ah

720A

306 × 173 × 222 mm

4,82(29)

€89.50 VAT incl.

TO BUY

VARTA

Marine battery Varta LA105 12V 95Ah AGM

12V

105

950

AGM

394 × 175 × 190 mm

4,82(24)

€243.90 VAT incl.

TO BUY

VARTA

Marine battery Varta LA70 12V 60Ah AGM

12V

760

AGM

278 × 175 × 190 mm

4,76(42)

€140.80 VAT incl.

TO BUY

Showing 1-18 of 310 item(s)

How to choose the right marine battery

The most expensive mistake in marine use is fitting a starter battery for service duty: the thin plates of an SLI cannot tolerate deep discharge and sulphate within 4-6 weeks of anchoring. The opposite is just as costly: using a service battery (thick plates) to crank an outboard — it doesn't deliver enough CCA and the starter motor doesn't get the peak it needs in cold water. Each role demands its own battery.

Typical capacities by marine use

Use	Typical capacity	Recommended technology
Starter, vessels <6 m	50-80 Ah	Marine SLI or AGM dual
Starter, vessels 6-12 m	80-130 Ah	Marine AGM (vibration-proof)
Cabin service (radio, GPS, plotter)	100-200 Ah	Deep cycle AGM
Large bank (fridge, windlass, autopilot)	200-400 Ah	GEL or LiFePO4
Sailing yacht, 3+ day autonomy	400-800 Ah	LiFePO4 (low weight, 100% DoD)

AGM vs GEL vs Lithium in marine

AGM is the modern standard: sealed, maintenance-free, 90° tilt-tolerant, 4-7 year service life with proper use. GEL handles extreme depth-of-discharge better (80% DoD cycles) but charges slower and won't accept fast engine charging. LiFePO4 lithium is the premium tier: 4x cycles, 100% usable capacity, a quarter of the weight. 2-3x the upfront cost, but pays back in heavy use. Requires a lithium-compatible charger profile.

Leading marine brands

Fullriver DC / DCG / FT — world reference in recreational marine, 1,200+ cycles at 50% DoD.
MK Battery AGM and Gel — sealed, 90° tilt and heavy vibration tolerant.
Trojan AGM Marine — premium AGM for large vessels and long-autonomy yachts.
Varta Professional Dual Purpose AGM — official dual range for small boats.
Optima Blue Top — AGM SpiralCell, top vibration resistance for powerful outboards.

Frequently asked questions

Why not a car battery on my boat?: Standard car batteries (SLI thin plates) deliver high CCA briefly and recharge from the alternator. In marine use, discharges are long and deep — destroying SLI in weeks. You need marine AGM (thicker plates) or deep cycle.
Will a dual battery work for engine + cabin?: Only on small boats (<6 m) with modest loads. As soon as equipment grows (fridge, plotter, autopilot), split banks: starter (50-80 Ah AGM) + service (100-200 Ah deep cycle AGM).
Is lithium worth it?: For occasional weekend use, no. For liveaboard or long cruises, yes: weight savings and 100% usable capacity (vs 50% lead) pay back in 3-4 years.
Returns?: Free 14-day returns for mainland Spain and Portugal if sealed.
How long does shipping take?: Standard delivery 1 to 5 working days to your country. We process orders within 24h.

Catalogue curated by our technical team. 11,551 Trustpilot reviews · 4.5/5. 24h mainland delivery, free 14-day returns.

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Online batteries · Varta distributor · 24h delivery · Batteries by capacity (Ah) · by size

Boat batteries: starting, house and dual purpose

Subcategories

Marine Dual Purpose Batteries

Choose right in 3 questions

Boat battery finder

How we find the right battery for your vehicle

What you will see on every compatible battery

Top 10 best-selling batteries

How to choose the right marine battery

Typical capacities by marine use

AGM vs GEL vs Lithium in marine

Leading marine brands

Frequently asked questions