Fullriver FT500 Full Throttle Series · Battery 40Ah 500A AGM
Specifications
| Brand | FULLRIVER |
|---|---|
| Part number | FT500 |
| Voltage (V) | 12 |
| Capacity (C20) | 40 |
| Cold cranking amps (EN) | 500 |
| Technology | AGM |
| Length | 250 mm |
| Width | 97 mm |
| Height | 206 mm |
Fullriver FT500 12V 40Ah 500A is a marine battery with reinforced anti-vibration case for moorings and offshore use. Tolerates the typical daily cycles on a boat (engine start + night-time services such as lights, sonar, fridge) and holds voltage even when the hull is rolling in open sea.
Why this marine battery?
- Marine designbuilt for boat swell and vibration
- Dual functionstarts the engine and powers onboard services
- Sealed and safemaintenance-free even when the boat rolls
Where it fits: the Fullriver FT500 is one of our boat batteries, belongs to our Fullriver batteries and by capacity it sits among our 40Ah batteries.
The Fullriver FT500 in practice
FT500 vs Fullriver FT450
The Fullriver FT500 offers 40 Ah and 500 A cold cranking in a 250 × 97 × 206 mm case. The Fullriver FT450, same brand and technology, stays at 30 Ah and 450 A and costs €25.40 less. If you hesitate between the two at a similar price, take this one: more capacity in the same size never hurts.

Marine battery Fullriver FT500 Full Throttle Series 40Ah 500A 12V
The Fullriver FT500 with AGM technology is a marine battery with 40 Ah and 500 A of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. Its 250 × 97 × 206 mm make it the exact replacement for the 40 Ah battery fitted as standard to many boats.
- Resistant to humidity and salt air.
- Sealed: no spills or gases in the locker.
- Ready for starting outboard and inboard engines.
- AGM: faster recharging and better cycle resistance than a conventional battery.
What the Fullriver FT500 is for
With 40 Ah, the Fullriver FT500 covers motor and sailing boats, both for engine starting and onboard services. At the end of the season, charge it fully before winter storage. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 14 kg and M6M terminals.
The Fullriver FT500: Full Throttle Series range and AGM technology
Within the Fullriver catalogue, the Full Throttle Series series groups the references designed for this use. The FT500 is the 40 Ah model of that family, with the same performance as its siblings in other sizes.
In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery.
Will it fit your current battery tray?
It has external dimensions of 250 × 97 × 206 mm and weighs 14 kg. It uses M6M terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.
Why choose Fullriver batteries
Fullriver specialises in deep-cycle AGM batteries for mobility, marine, solar and traction. Its DC and HC series are known for their tolerance to deep discharge and long cycle life. All the Fullriver batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
Usage and maintenance tips
Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators.
Official warranty
The Fullriver FT500 comes with the manufacturer's official warranty against manufacturing defects. Deep discharge from winter lay-up without charging is not covered.
Delivery times and returns
Orders placed before 6:00 pm with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic Islands and the rest of the European Union allow 3 to 5 working days. You have 14 days to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.
Other 40Ah batteries: We stock 23 models of 40 Ah to compare by price, technology and cold cranking: see all 40Ah batteries. Same size (250 × 97 × 206 mm): batteries of 250 × 97 × 206 mm.
Recommended accessories
Frequently asked questions
Is the Fullriver FT500 an AGM battery and what are the benefits of AGM?
Yes, it is AGM. In an AGM battery such as the FT500, the electrolyte is not free but absorbed in a glass-fibre mat inside a sealed lead-acid battery. Compared with a conventional battery it withstands more charge/discharge cycles and handles heat better.
In what position can it be installed on the boat?
Being AGM, it is sealed and does not spill: it can be mounted tilted (never upside down) and copes well with vibration and wave impacts. Secure it firmly and keep the terminals away from water.
What are the dimensions of the Fullriver FT500 battery?
Its dimensions are 250×97×206 mm, also written 250x97x206 mm; the height already includes the terminals. Check the room available in your boat, because a single millimetre too much can stop the clamp from closing.
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