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).

Verified customer reviews about baterias.com on Trustpilot.

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

Order now with express shipping: your product ships on Monday and arrives on Tuesday before 2 PM (Spain mainland and Portugal only).

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.

Página 1 de 12 — productos 1-20 de 230

100% secure payment

Subscribe to our newsletter

Deals, news and battery tips. No spam.

Products

Information

Your account

Store information

Sale of batteries online at the best price
We only work top brand batteries
free advice
Excellent after-sales service

This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.

More information

Functional cookies

Yes

Description and cookies

Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.


PHP_SESSID	baterias.com	The PHPSESSID cookie is native to PHP and allows websites to store serialised status data. On the website it is used to establish a user session and to pass state data through a temporary cookie, which is commonly known as a session cookie. These Cookies will only remain on your computer until you close your browser.	Session
PrestaShop-#	baterias.com	This is a cookie used by Prestashop to store information and keep the user's session open. It stores information such as currency, language, customer ID, among other data necessary for the proper functioning of the shop.	480 hours

Advertising Cookies

Yes

Description

These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.

Analytics cookies

Yes

Description

Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.

Performance cookies

Yes

Description

These are used to improve the browsing experience and optimize the operation of the shop.

Other cookies

Yes

Description

These are cookies without a clear purpose or those that we are still in the process of classifying.

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

AGM marine batteries

Compatible batteries

Start-Stop battery Varta A7 12V 70Ah 760A AGM

Start-Stop battery Varta E39 12V 70Ah 760A AGM

Start-Stop battery Exide EK700 12V 70Ah 760A AGM

Start-Stop battery Varta A9 12V 50Ah 540A AGM

Marine battery Varta LA95 12V 85Ah AGM

Marine battery Exide EP600 12V 70Ah 760A AGM

Start-Stop battery Tudor TK700 12V 70Ah 760A AGM

Marine battery Exide EP1500 12V 180Ah 900A AGM

Marine battery Varta LA70 12V 60Ah AGM

Marine battery Exide EQ800 12V 95Ah 850A AGM

Caravan battery Kronobat EV-95-AGM 12V 95Ah 850A AGM

Caravan battery Kronobat DP-70-AGM 12V 70Ah 760A AGM

Caravan battery Kronobat DP-95-AGM 12V 95Ah 850A AGM

Caravan battery Kronobat DP-105-AGM 12V 105Ah 950A AGM

Caravan battery Kronobat DP-60-AGM 12V 60Ah 680A AGM

Caravan battery Kronobat DP-80-AGM 12V 80Ah 800A AGM

Caravan battery Kronobat EV-105-AGM 12V 105Ah 950A AGM

Auxiliary battery Exide EK500 12V 50Ah 570A AGM

Auxiliary battery Tudor TK500 12V 50Ah 570A AGM

Subscribe to our newsletter