What is the difference between dual purpose and deep cycle?

A dual-purpose battery can deliver engine-cranking current and tolerate moderate service discharges; a deep-cycle battery maximises long-discharge cycles but isn't optimised for starting. With a single battery on board, dual purpose is the right compromise.

Will a dual-purpose battery start my outboard?

Yes, as long as it meets the minimum cranking current (EN A or MCA) and capacity stated by the engine manufacturer. Also check the battery-box dimensions and terminal type.

How long does a marine dual-purpose battery last?

With proper charging and correct winter storage (charged and disconnected, or on a maintainer), a quality AGM dual purpose typically lasts several seasons. Repeated discharge below 50% shortens its life.

Can it be mounted at an angle?

Sealed AGM batteries tolerate different mounting positions and will not spill electrolyte as the boat rolls, although upright installation, well secured in its box, is recommended.

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Marine Dual Purpose Batteries

Marine dual-purpose batteries combine engine starting and on-board service power in a single block: navigation electronics, fish finder, lights, fridge or windlass. They are the practical choice for boats with limited space that don't want two separate battery banks.

We stock the dual-purpose ranges from Fullriver (AGM DC series), Varta Professional, Exide and Kronobat, covering everything from small motorboats and RIBs to sailing yachts and fishing boats.

There are 152 products.

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Showing 1-18 of 152 item(s)

EXIDE

Marine battery Exide EP800 12V 95Ah 850A AGM

12V

95Ah

850A

AGM

353 × 175 × 190 mm

4,79(66)

€132.65 VAT incl.

TO BUY

VARTA

Marine battery Varta LA95 12V 85Ah AGM

12V

850

AGM

353 × 175 × 190 mm

4,70(60)

€181.75 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP600 12V 70Ah 760A AGM

12V

70Ah

760A

AGM

278 × 175 × 190 mm

4,78(50)

€104.05 VAT incl.

TO BUY

OPTIMA

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

12V

75Ah

975A

325 × 165 × 238 mm

4,80(34)

€263.05 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP1200 12V 140Ah 700A AGM

12V

140Ah

700A

AGM

513 × 189 × 223 mm

4,79(49)

€269.18 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP450 12V 50Ah 750A AGM

12V

50Ah

750A

AGM

260 × 173 × 206 mm

4,77(29)

€141.15 VAT incl.

TO BUY

VARTA

Marine battery Varta LA80 12V 77Ah AGM

12V

80Ah

800A

AGM

315 × 175 × 190 mm

4,78(32)

€154.15 VAT incl.

TO BUY

VARTA

Marine battery Varta LFD140 12V 119Ah

12V

140

800

513 × 189 × 223 mm

4,79(39)

€180.72 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER550 12V 115Ah 760A

12V

115Ah

760A

349 × 175 × 235 mm

4,80(38)

€122.65 VAT incl.

TO BUY

OPTIMA

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

12V

55Ah

765A

254 × 175 × 200 mm

4,81(34)

€216.23 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER350 12V 80Ah 570A

12V

80Ah

570A

270 × 173 × 222 mm

4,79(33)

€84.50 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP900 12V 100Ah 800A AGM

12V

100Ah

800A

AGM

330 × 173 × 240 mm

4,82(29)

€245.30 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER450 12V 95Ah 720A

12V

95Ah

720A

306 × 173 × 222 mm

4,83(27)

€88.85 VAT incl.

TO BUY

VARTA

Marine battery Varta LA105 12V 95Ah AGM

12V

105

950

AGM

394 × 175 × 190 mm

4,83(23)

€243.20 VAT incl.

TO BUY

VARTA

Marine battery Varta LA70 12V 60Ah AGM

12V

760

AGM

278 × 175 × 190 mm

4,76(40)

€140.15 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP1500 12V 180Ah 900A AGM

12V

180Ah

900A

AGM

513 × 223 × 223 mm

4,81(34)

€315.27 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP2100 12V 240Ah 1200A AGM

12V

240Ah

1200A

AGM

518 × 274 × 240 mm

4,80(32)

€384.15 VAT incl.

TO BUY

VARTA

Marine battery Varta LED70 12V 70Ah EFB

12V

70Ah

760A

EFB

278 × 175 × 190 mm

4,82(27)

€116.20 VAT incl.

TO BUY

Showing 1-18 of 152 item(s)

One battery to start the engine and run the boat

A pure starter battery delivers a lot of current for a few seconds but copes badly with deep discharges; a deep-cycle battery withstands long discharges but isn't designed for cranking peaks. A marine dual-purpose battery sits between the two: thicker plates than a starter battery and a much higher discharge capability, so it can crank your outboard or inboard engine and also power the boat's loads without damage.

When to choose dual purpose

Boats with a single battery bank or limited space.
Motorboats, RIBs and fishing boats with moderate electronics (sounder, GPS, lights, radio).
Small and mid-size sailing yachts that want a simpler installation.
As the only battery where the engine manufacturer allows it; for heavy loads (large fridge, autopilot, inverter) consider a dedicated deep-cycle bank.

AGM technology: the usual choice on board

Most modern dual-purpose batteries are sealed AGM: maintenance-free, spill-proof even when the boat heels, highly vibration-resistant and quick to recharge from the engine alternator or a shore charger. Use the comparison tool to compare capacity (Ah), cranking current and dimensions across series.

Frequently asked questions about marine dual-purpose batteries

What is the difference between dual purpose and deep cycle?: A dual-purpose battery can deliver engine-cranking current and tolerate moderate service discharges; a deep-cycle battery maximises long-discharge cycles but isn't optimised for starting. With a single battery on board, dual purpose is the right compromise.
Will a dual-purpose battery start my outboard?: Yes, as long as it meets the minimum cranking current (EN A or MCA) and capacity stated by the engine manufacturer. Also check the battery-box dimensions and terminal type.
How long does a marine dual-purpose battery last?: With proper charging and correct winter storage (charged and disconnected, or on a maintainer), a quality AGM dual purpose typically lasts several seasons. Repeated discharge below 50% shortens its life.
Can it be mounted at an angle?: Sealed AGM batteries tolerate different mounting positions and will not spill electrolyte as the boat rolls, although upright installation, well secured in its box, is recommended.

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