# Marine and boat batteries > Over 230 marine batteries for engine starting and onboard service: Fullriver, Exide, Varta, Optima and Odyssey in AGM, GEL, EFB and lithium, VAT included. **Category:** [Beginning](https://bateriasonline.es/en/) → [Battery types: starter, deep cycle, traction and stationary](https://bateriasonline.es/en/batteries) → [Starter batteries](https://bateriasonline.es/en/starter-batteries) - **Canonical URL**: https://bateriasonline.es/en/marine-boat-batteries - **Language**: en ## Description Boat batteries to start the engine or power onboard systems, such as Exide EP800 or Varta LA95; buy online with the shipping cost shown upfront. A boat usually needs two things from its batteries: a reliable engine start and steady power for navigation, lights, pumps and fridge while at anchor. Depending on the vessel, one battery handles both or each task has its own bank. Compare starting, dual-purpose and deep cycle marine batteries by their real data. ## Starting, service or both - **Starting battery**: high CCA for the engine, recharged by the engine alternator. Capacity is secondary. - **Service (house) battery**: built for deep, repeated discharges to run electronics and appliances. Ah and cycle life count most. - **Dual-purpose battery**: a compromise for small boats with a single battery; explained in our section on [dual-purpose marine batteries](https://bateriasonline.es/en/dual-purpose-marine-batteries). ## Why the technology matters on water Movement, humidity and confined spaces favour sealed designs. **AGM** and **GEL** batteries do not spill when the hull heels, emit very little gas in normal use and tolerate vibration. Flooded marine batteries remain a reasonable option in well-ventilated compartments, provided they are fixed securely and electrolyte levels are checked. Spiral-wound AGM batteries such as those from [OPTIMA](https://bateriasonline.es/en/optima-batteries) stand out for vibration resistance. ## Sizing the service bank Add up the daily consumption of each device in Ah (current × hours of use). To protect lead-acid batteries, avoid discharging them below about half their capacity, so the bank should be roughly twice your daily need. If your boat also charges from solar panels or shore power, check that each charger has a profile for the chosen chemistry. A battery isolator or DC-DC charger lets the engine alternator charge both banks without the house loads draining the starting battery. Similar service batteries are used in motorhomes; see [caravan and motorhome batteries](https://bateriasonline.es/en/leisure-batteries-motorhome-caravan). To compare boats with other vehicles, browse every type of [starter battery](https://bateriasonline.es/en/starter-batteries). ## Frequently asked questions ### How do I keep batteries in good shape over winter? Charge them fully, disconnect loads with the main switch and keep them on a maintenance charger or recharge every few weeks. A flat battery left in cold conditions can freeze. ### Can I mix different batteries in the same bank? Avoid it. Batteries of different age, capacity or technology charge unevenly and the weakest shortens the life of the rest. ## Choose by brand The same marine and boat batteries, filtered by manufacturer. Each brand has its own page with all its references and a buying guide. - [Fullriver batteries](https://bateriasonline.es/en/fullriver-batteries) (104) - [Exide batteries](https://bateriasonline.es/en/exide-batteries) (66) - [Varta batteries](https://bateriasonline.es/en/varta-batteries) (39) - [Odyssey batteries](https://bateriasonline.es/en/odyssey-batteries) (6) - [Fulbat batteries](https://bateriasonline.es/en/fulbat-batteries) (6) - [Kronobat batteries](https://bateriasonline.es/en/kronobat-batteries) (5) - [Tudor batteries](https://bateriasonline.es/en/tudor-batteries) (4) - [Optima batteries](https://bateriasonline.es/en/optima-batteries) (4) - [Trojan batteries](https://bateriasonline.es/en/trojan-batteries) (3) ## Products in this category | Product | Brand | Price | |---|---|---| | [Optima BTDC-4.2 · Boat battery 12V 55Ah 765A](https://bateriasonline.es/en/optima-btdc-4-2) | Optima | 212,24 € | | [Exide ES290 · Boat battery 12V 25Ah 150A](https://bateriasonline.es/en/exide-es290) | Exide | 83,21 € | | [Exide ES450 · Boat battery 12V 40Ah 280A](https://bateriasonline.es/en/exide-es450) | Exide | 115,17 € | | [Exide ES650 · Boat battery 12V 56Ah 410A](https://bateriasonline.es/en/exide-es650) | Exide | 139,52 € | | [Exide ES900 · Boat battery 12V 80Ah 540A](https://bateriasonline.es/en/exide-es900) | Exide | 172,45 € | | [Exide ES950 · Boat battery 12V 85Ah 450A](https://bateriasonline.es/en/exide-es950) | Exide | 180,39 € | | [Exide ES1000-6 · Boat battery 6V 195Ah 900A](https://bateriasonline.es/en/exide-es1000-6) | Exide | 215,18 € | | [Exide ES1100-6 · Boat battery 6V 200Ah 950A](https://bateriasonline.es/en/exide-es1100-6) | Exide | 311,44 € | | [Exide ES1200 · Boat battery 12V 110Ah 760A](https://bateriasonline.es/en/exide-es1200) | Exide | 263,42 € | | [Exide ES1300 · Boat battery 12V 120Ah 750A](https://bateriasonline.es/en/exide-es1300) | Exide | 228,73 € | | [Exide EZ650 · Boat battery 12V 75Ah 750A](https://bateriasonline.es/en/exide-ez650) | Exide | 105,74 € | | [Exide ES1350 · Boat battery 12V 120Ah 760A](https://bateriasonline.es/en/exide-es1350) | Exide | 275,54 € | | [Exide ES1600 · Boat battery 12V 140Ah 900A](https://bateriasonline.es/en/exide-es1600) | Exide | 327,62 € | | [Exide EU80-6 · Boat battery 6V 80Ah 600A](https://bateriasonline.es/en/exide-eu80-6) | Exide | 100,17 € | | [Exide ES2400 · Boat battery 12V 210Ah 1,030A](https://bateriasonline.es/en/exide-es2400) | Exide | 390,69 € | --- *bateriasonline.es — Batteries and accessories · 2026-11-11*