Fullriver FT230L: on-board battery for marine and motorhome use 20Ah 12V 230A

In short: Drivers and owners of boats and motorhomes know this one as the Fullriver FT230L. Get the size and terminal side right and you are most of the way there.

Fullriver FT230L for boats and motorhomes

Narrowboats and fishing boats sometimes carry a Fullriver FT230L too. Weighing 7 kg, it needs a firm footing in the locker. Buying batteries online saves carrying heavy units along a pontoon twice.

A modest 20Ah keeps size and weight down for tight spaces. A cranking figure of 230A is high for a case this size.

Quick compatibility checklist

• ✓ Diesels and big engines need the full 230A or more.
• ✓ It comes with M6 terminals, so check that your leads, lugs or plugs can attach to them without adapters.
• ✓ Built with AGM technology: if your vehicle or system was set up for another chemistry, check the charging settings first.

Technical figures at a glance

Questions and answers

AGM: how it works

Many glass-mat designs tolerate sideways mounting, as long as the maker says so. Glass-mat batteries recover well after a deep discharge compared with flooded ones. Store AGM batteries charged and disconnected.

Alternatives that fit the same space

If you prefer another make, these fit the same space with the same terminal side.

Fullriver DC20-12Fullriver FT230Fullriver FT230DFullriver DC17-12

Explore more

Everything you need to order the Fullriver FT230L is on this page. Recycling the old battery is easy at most tips and garages.

• Browse the full range for boats and motorhomes
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Practical advice for boats and motorhomes

A caravan with a motor mover asks for big bursts of current. Keep the engine battery and the domestic bank separate, linked by a splitter or a DC-DC charger. Leaving the charger on the wrong chemistry setting can quietly overcharge or undercharge a whole season.