True deep-cycle AGM for house banks on boats, second batteries in 4x4s and campers, off-grid homes and solar systems. Thicker plates and more lead than standard AGM for maximum reserve capacity and cycle life. 12V · 55Ah (C20) · 17.6 kg · maintenance-free.
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The Fullriver DC series is a true deep-cycle AGM range: thicker plates and a higher lead content than conventional batteries deliver more reserve capacity and more cycles under repeated deep discharge. Sealed, valve-regulated and completely maintenance-free, the DC55-12 is our standard recommendation for house banks in the tropics, on boats and in off-grid homes alike — it tolerates heat, vibration and the daily charge/discharge cycle.
Fullriver rate the DC series to an 80% depth of discharge — their own published limit — where much quality AGM is held to 50%. On this 55 Ah battery that is the difference between planning around 28 Ah and planning around 44 Ah, so a smaller, lighter bank can carry the same night away from the mains. Deep cycling is still work: a bank that is fully recharged after every use will outlast one that isn’t, so pair it with a multi-stage AGM charger set up with temperature compensation. In tropical heat that one setting protects your investment more than anything else you can fit.
| Nennspannung | 12 V |
| Kapazität @20 Std. | 55 Ah |
| Kapazität bei 100 Stunden | 61 Ah |
| Chemie | AGM, versiegelte VRLA, auslaufsicher |
| Gewicht | 17,6 kg |
| Abmessungen (L×B×H) | 229 × 138 × 212 mm |
| Terminals | M6 |
| BCI-Gruppe | 22NF |
| Anmerkungen | CCA 400A · Reserve 96 min @25A |
Charge with an AGM profile. Fullriver specify 14.7 V bulk/absorption and 13.7 V float at 25 °C, temperature-compensated at −4 mV/°C per cell, and a bulk current of about 20% of the 20-hour capacity — roughly 11 A for one DC55-12, or 22 A for a pair. Matching multi-stage chargers: Kisae Abso 20A charger (AC1220). Not sure what bank size or charger you need? Use our Batteriebank- und Kabelgrößenrechner or message us on LINIE oder WhatsApp.
Sealed and non-spillable — classified non-hazardous for transport (49 CFR 173.159(d), IATA A67/A48), so it ships by air, sea or road with no dangerous-goods surcharge and can be mounted in any orientation except inverted. Every battery is bench-tested in our Trang warehouse before dispatch.
Free delivery in Trang, Krabi and Phuket on our weekly courier run; nationwide courier typically 1–3 days. Collection from our Trang warehouse is welcome. Covered by Fullriver’s manufacturer’s warranty — we handle any claim for you here in Thailand; ask us for the current terms.
Two DC55-12 in series give 24 V 55 Ah; two of those pairs in parallel give 24 V 110 Ah (2.6 kWh stored, about 2.1 kWh usable within Fullriver's 80% limit). Four in parallel give 12 V 220 Ah. Keep every cable in a parallel set the same length, fuse the bank at the battery, fit the temperature sensor to a middle battery, and replace a bank as a set rather than one battery at a time.
Charging a 24 V bank of four: bulk current of about 22 A, so the Kisae Abso AC2430 30 A 24 V charger from a generator or the mains, or a 24 V solar controller sized to your panels. Size the bank and the cable, or send us what you run on LINIE and an engineer will check it.
Fitted in the canopy or under a seat, the DC55-12 gives 44 Ah of usable energy at Fullriver's 80% depth of discharge: enough for a 35–45 L compressor fridge, LED lights and phone charging for a night without starting the engine. It is sealed, so it can be mounted on its side, and it shrugs off corrugations.
Charge it from the vehicle with a DC-DC charger rather than a split-charge relay, so a smart alternator and a long cable run still deliver a full AGM charge. Fullriver recommend a bulk current of about 20% of capacity, about 11 A for one DC55-12, so the 30 A KISAE Abso DMT1230 (30 A) suits two or more of these in parallel; for a single battery, tell us your vehicle on LINE and we match the charger for you. Every KISAE charger comes with a free temperature sensor and its page carries the manufacturer's cable and fuse table. Add a battery monitor and you can see the state of charge instead of guessing.
On a longer trip the battery is topped up as you go: 200 W of solar on the roof returns about 50 Ah a day in Thai sun and the DC-DC charger refills the bank as you drive, so a fridge, lights and phones (about 40–50 Ah a day) keep going for a week or more.
Read dual-battery systems explained, or use the Drake SVO sizing calculator and send the result to an engineer on LINE to check, free.
Many modern vehicles have smart alternators that lower the voltage once the starting battery is full, so a relay leaves an AGM battery part-charged. A DC-DC charger gives it the full AGM profile Fullriver specify (14.7 V absorption, 13.7 V float); the dual-battery guide explains why.
Yes. It is sealed and non-spillable, so it can be mounted upright or on its side, which gives you more options in a canopy, under a seat or in a locker.
Mount it shaded with some airflow, and charge it with temperature compensation: Fullriver specify −4 mV/°C per cell, and the battery temperature sensor that does this comes free with every compatible KISAE charger.
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