AGM
Marine AGM Batteries - Sealed Lead-Acid Power
Premium AGM (Absorbed Glass Mat) marine batteries for reliable, maintenance-free power. Our AGM collection features sealed lead-acid batteries from Victron Energy, Mastervolt, Fullriver, and other leading manufacturers.
AGM batteries provide superior performance for house banks, starting, and thruster applications with no maintenance, no spillage, and excellent vibration resistance. Perfect for sailboats, powerboats, and all marine applications.
Complete Battery System: Part of our Batteries collection. Compare with lithium batteries for weight savings. Store in battery boxes. Connect with battery terminals. Charge with battery chargers. Monitor with battery monitors. Protect with isolators.
Frequently asked questions
What is a deep cycle marine AGM battery?
It's a sealed lead-acid battery built to be discharged and recharged again and again in a house bank, rather than giving short bursts to start an engine. The Victron deep cycle and super cycle batteries here are made for that job. Tell us your bank size and loads, and we'll help you pick one.
AGM or lithium?
AGM is sealed and maintenance-free. Lithium (LiFePO4) is lighter for the same capacity and can be discharged more deeply. Compare our lithium batteries or ask us which suits your boat.
Where AGM still makes sense
AGM batteries remain a solid choice where budget, charging simplicity or drop in replacement of an existing lead acid bank matters more than weight saving. Unlike lithium, AGM tolerates a wider range of chargers and alternators without a dedicated battery management system, and it can sit in an unheated locker through a UK winter without the same cold temperature charging restrictions that lithium chemistries have.
Sizing a bank correctly means working out your realistic daily amp hour draw rather than just matching the physical space available, and keeping starting, house and thruster banks separate where the boat's original wiring allows it. AGM batteries also don't like being left partially discharged for long periods, so a decent charger or solar trickle feed extends service life considerably.
Check terminal type and physical dimensions against your existing battery box before ordering, since AGM cases vary in height even within a similar amp hour rating.
