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Personal help from Denmark, before and after purchaseEquipment for boats & campersDelivery & terms

Boat batteries — power for life on board

Cooling, lights and electronics share the same energy store. Compare lithium, AGM and gel for your consumption, space and charging system.
Browse the range See AGM batteries See gel batteries

Vælg den rigtige batteritype

Sammenlign de mest relevante batterityper til både, autocampere og off-grid-opsætninger.

Lithium batteries
For modern electrical systems

Lithium batteries

Low weight, high usable capacity and long service life make lithium the natural choice for modern power systems in boats, campers and off-grid setups.
  • Up to 90% usable capacity
  • Quick charge
  • Low weight
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AGM batteries
Enkel og pålidelig

AGM batteries

Choose AGM for classic installations and lower consumption. A robust and maintenance-free solution that works reliably in most boats and campers.
  • Omkring 50 % brugbar kapacitet
  • Maintenance-free
  • Pålidelig løsning
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Gel batteries
Stable usage

Gel batteries

Choose gel if your power usage is steady and predictable. A solid, maintenance-free option suited for consistent loads over time.
  • Ca. 70 % brugbar kapacitet
  • Maintenance-free
  • Stable under constant use
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Hjælp til valg af batteri

What should you choose?

Different battery types suit different needs. Here is a quick rule of thumb.

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Lithium Batteries – Maximum Performance

High capacity, low weight and fast charging make lithium the ideal choice for modern setups and higher power usage.

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AGM batteries – simple setup

A reliable and maintenance-free choice for classic installations and lower power consumption.

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Gel batteries – stable use

Well suited for steady power consumption and long-term use where stability is important.

Why buy batteries from SejlStrøm?

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Personal guidance

I help you choose the right battery based on your setup and power consumption.

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Afprøvede løsninger

I don’t just sell batteries – I help you build a system that works in real life.

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Selected for marine & off-grid

Products are carefully selected for boats, campers, and off-grid use – not random webshop items.

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Swift delivery

Fast delivery in Denmark and support before and after your purchase.

Guides and help choosing batteries

Learn more about capacity, installation, and choosing the right battery type.

On-board electrical system guide
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On-board electrical system guide
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On-board electrical system guide
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