What does AGM mean on a battery?

AGM (Absorbent Glass Mat) is a sealed lead-acid technology where the electrolyte is absorbed into a glass fibre mat. It is leak-proof, withstands more charge/discharge cycles and tolerates heat better than conventional batteries. AGM is fitted to boats with advanced Start-Stop and regenerative braking.

Which boats use AGM batteries?

boats with advanced Start-Stop, regenerative braking or high electrical loads (advanced driver assists, permanent climate control, heated seats). Brands like BMW, Audi, Mercedes-Benz and Volvo have fitted AGM as standard since around 2010 on their efficient-engine models.

How long does an AGM battery last?

Between 5 and 8 years under normal conditions — 50% to 100% longer than a conventional battery. Real-world life depends on Start-Stop usage, extreme temperatures and short-trip frequency. If the vehicle does many short trips or has very active Start-Stop, check the battery from year 5 onwards.

Can I fit an AGM in place of an EFB or conventional battery?

Yes — AGM can replace EFB or conventional batteries (AGM is the superior technology). What you must NEVER do is the opposite: fit an EFB or conventional in a vehicle that originally had AGM — it would degrade within months and Start-Stop would fail.

Do I need to register the AGM battery when I replace it?

Yes — most modern cars with a BMS (Battery Management System) require the new battery to be registered via OBD so the alternator applies the correct charging profile. Without this step the battery will be charged incorrectly and lifespan will be cut significantly. Any workshop with a basic OBD tool can do it (~£10-20).

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AGM marine batteries

AGM marine batteries combine strong cranking with cyclic capacity — perfect for inboard/outboard boats with on-board electronics.

Vibration-resistant and fully sealed: safe in marine conditions.
Zero maintenance: ideal for marinas or long lay-ups.
Cyclic capacity: power fridge, sounder, lights and auxiliary gear without penalising cranking.

See all AGM batteries →

Compatible batteries

Before you buy: check 3 key points

Although the batteries shown are sourced from information provided by manufacturers, we recommend checking on your current battery:

Dimensions (length × width × height, including terminals and protrusions)
The dimensions shown are the maximum of the battery and include the height of the terminals, small ridges at the base and any lateral protrusions. Measure your current battery completely, from edge to edge. The new one must be the same size or slightly smaller — never larger, it would not fit in the housing.
Positive terminal (left or right viewed from the front — check the battery photo carefully)
Stand facing the battery, with the manufacturer's label facing you and the terminals on top. Locate the terminal marked with +: if it is on your right, it is "positive right"; if it is on your left, it is "positive left". Do not rely on how the battery is mounted in the car — the position is always measured looking only at the battery itself.
Technology (AGM, EFB or conventional — Start-Stop requires AGM or EFB)
Depending on the manufacturer, the same technology may be labelled differently: AGM may also appear as VRLA, AGM Start-Stop or AGM Deep Cycle. EFB may appear as EF, EFB+ or Enhanced Flooded Battery. Conventional may appear as SLI, Lead-Acid, Wet or Standard. If your vehicle has Start-Stop, the battery must be AGM or EFB — never conventional.

If you have any questions, just ask us and we'll be glad to advise you with no obligation.

This engine comes with an AGM/EFB battery as standard: the car's charging system requires it even without Start-Stop. If in doubt, message us and we will confirm.

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

AGM marine batteries

Compatible batteries

Marine battery Fullriver DC220-6 6V 220Ah 990A AGM

Marine battery Fullriver DC224-6A 6V 224Ah AGM

Marine battery Fullriver DC180-8A 8V 180Ah AGM

Marine battery Fullriver DC215-12 12V 215Ah 1000A AGM

Marine battery Fullriver DC26-12A 12V 26Ah 160A AGM

Marine battery Fullriver DC180-12 12V 180Ah 990A AGM

Marine battery Fullriver DC210-12 12V 210Ah 1180A AGM

Marine battery Fullriver DC24-12 12V 24Ah 160A AGM

Marine battery Fullriver DC17-12 12V 17Ah 120A AGM

Marine battery Fullriver DC20-12 12V 20Ah 135A AGM

Marine battery Fullriver DC200-6 6V 200Ah 1050A AGM

Marine battery Fullriver DC200-6B 6V 200Ah 1000A AGM

Marine battery Fullriver DC200-8 8V 200Ah 1150A AGM

Marine battery Fullriver DC220-12 12V 220Ah 1150A AGM

Marine battery Fullriver DC240-12 12V 240Ah 1200A AGM

Marine battery Fullriver DC245-6 6V 245Ah 930A AGM

Marine battery Fullriver DC250-6 6V 250Ah 960A AGM

Marine battery Fullriver DC26-12B 12V 26Ah 160A AGM

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