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.

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 1-24 of 152 item(s)

VARTA

Marine battery Varta LA95 12V 85Ah AGM

12V

850

AGM

353 × 175 × 190 mm

4,69(56)

€181.75 VAT incl.

TO BUY

VARTA

Marine battery Varta LFD140 12V 119Ah

12V

140

800

513 × 189 × 223 mm

4,79(36)

€180.72 VAT incl.

TO BUY

VARTA

Marine battery Varta LA60 12V 60Ah AGM

12V

60Ah

680A

AGM

242 × 175 × 190 mm

4,82(31)

€147.10 VAT incl.

TO BUY

VARTA

Marine battery Varta LFS105N 12V 85Ah

12V

105

800

330 × 175 × 240 mm

4,81(35)

€215.27 VAT incl.

TO BUY

VARTA

Marine battery Varta LED80 12V 80Ah EFB

12V

80Ah

800A

EFB

314 × 175 × 190 mm

4,77(23)

€135.05 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTDC-4.2 12V 55Ah AGM

12V

55Ah

765A

254 × 172 × 173 mm

4,83(30)

€216.23 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP2100 12V 240Ah AGM

12V

240Ah

1200A

AGM

518 × 279 × 240 mm

4,81(26)

€384.15 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP500 12V 60Ah AGM

12V

60Ah

680A

AGM

242 × 175 × 190 mm

4,80(29)

€99.10 VAT incl.

TO BUY

VARTA

Marine battery Varta LED70 12V 70Ah EFB

12V

70Ah

760A

EFB

277 × 175 × 190 mm

4,82(24)

€116.20 VAT incl.

TO BUY

VARTA

Marine battery Varta LED95 12V 95Ah EFB

12V

95Ah

850A

EFB

353 × 175 × 190 mm

4,77(24)

€163.05 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP1500 12V 180Ah AGM

12V

180Ah

900A

AGM

513 × 223 × 223 mm

4,81(32)

€328.99 VAT incl.

TO BUY

VARTA

Marine battery Varta LA80 12V 77Ah AGM

12V

80Ah

800A

AGM

315 × 175 × 190 mm

4,77(30)

€154.15 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTDC-5.0 12V 66Ah AGM

12V

66Ah

845A

309 × 172 × 200 mm

4,80(29)

€225.05 VAT incl.

TO BUY

VARTA

Marine battery Varta LA105 12V 95Ah AGM

12V

105

950

AGM

394 × 175 × 190 mm

4,84(22)

€243.20 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP1200 12V 140Ah AGM

12V

140Ah

700A

AGM

513 × 189 × 223 mm

4,81(44)

€269.18 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTDC-5.5 12V 75Ah AGM

12V

75Ah

975A

325 × 158 × 218 mm

4,80(29)

€263.05 VAT incl.

TO BUY

EXIDE

Marine battery Exide EP450 12V 50Ah AGM

12V

50Ah

750A

AGM

260 × 173 × 206 mm

4,77(28)

€141.15 VAT incl.

TO BUY

VARTA

Marine battery Varta LED240 12V 240Ah EFB

12V

240Ah

1050A

EFB

518 × 276 × 242 mm

4,80(38)

€295.37 VAT incl.

TO BUY

VARTA

Marine battery Varta LED60 12V 60Ah EFB

12V

60Ah

640A

EFB

242 × 175 × 190 mm

4,74(24)

€97.10 VAT incl.

TO BUY

FULLRIVER

Marine battery Fullriver DC40-12 12V 40Ah AGM

12V

40Ah

275

AGM

198 × 166 × 174 mm

4,81(16)

€162.33 VAT incl.

TO BUY

FULLRIVER

Marine battery Fullriver DC35-12A 12V 35Ah AGM

12V

35Ah

190

AGM

196 × 131 × 167 mm

4,77(39)

€139.73 VAT incl.

TO BUY

EXIDE

Marine battery Exide ER450 12V 95Ah

12V

95Ah

650A

306 × 173 × 222 mm

4,82(24)

€88.85 VAT incl.

TO BUY

VARTA

Marine battery Varta LED190 12V 190Ah EFB

12V

190Ah

1050A

EFB

513 × 223 × 223 mm

4,77(28)

€220.52 VAT incl.

TO BUY

OPTIMA

Marine battery Optima BTSLI-4.2 12V 50Ah AGM

12V

50Ah

815A

254 × 172 × 173 mm

4,76(23)

€180.80 VAT incl.

TO BUY

Showing 1-24 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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