Fulbat FDM12-825-M31 · Marine battery 12V 105Ah 825A AGM CARBON
Specifications
| Brand | FULBAT |
|---|---|
| Part number | FDM12-825-M31 |
| Voltage (V) | 12V |
| Capacity (C20) | 105Ah |
| Technology | AGM Carbon |
| Length | 330mm |
| Width | 173mm |
| Height | 237mm |
| Terminal layout | Positive left |
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Fulbat FDM12-825-M31 12V 105Ah 825A is a quality battery with official manufacturer warranty, confirmed stock and 24-48 h delivery across the peninsula.
Why this battery?
- Tested and certifiedto European EN standards for maximum reliability
- Sealed and maintenance-freeready to use out of the box
- Long working lifeoptimised for its real-world use case
Voltage
12 V
Capacity
105 Ah
Cold cranking
825 A
Dimensions
330×173×237 mm
Technology
AGM
Polarity
Positive on the left
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Marine battery Fulbat FDM12-825-M31 105Ah 825A 12V
12VVoltage
105AhCapacity
825ACold cranking
The Fulbat FDM12-825-M31 with AGM technology is a marine battery with 105 Ah and 825 A of cold cranking current (EN) for motor and sailing boats, both for engine starting and onboard services. Its 330 × 173 × 237 mm and the positive terminal on the left make it the exact replacement for the 105 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 Fulbat FDM12-825-M31 is for
With 105 Ah, the Fulbat FDM12-825-M31 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 DT terminals.
Dimensions, polarity and mounting
It has external dimensions of 330 × 173 × 237 mm. The positive terminal on the left decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses DT 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.
Fulbat: the maker behind the FDM12-825-M31
French brand Fulbat is a European reference in motorcycle, garden and leisure batteries: compact ranges, clear JIS codes and a consistent quality that workshops know well. All the Fulbat batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
Technology inside the Fulbat FDM12-825-M31
Within the Fulbat catalogue, the FDM12-825-M31 is the 105 Ah model designed for this application.
AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly.
Care and maintenance
At the end of the season, charge the battery fully and, if possible, keep it on a charger over the winter lay-up. Protect the terminals with dielectric grease and check the fixing: vibration and swell loosen connections.
Warranty and coverage
The Fulbat FDM12-825-M31 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
Same-day dispatch from our warehouse for in-stock orders placed before 6:00 pm: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for 14 days if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.
BCOM-FULBAT-FDM12-825-M31
Data sheet
- Brand
- FULBAT
- Model
- FULBAT FDM Marine AGM Carbon
- Voltage (V)
- 12V
- Length
- 330mm
- Width
- 173mm
- Height
- 237mm
- Technology
- AGM Carbon
- Terminal layout
- Positive left
- Terminal type
- DT
- Cold cranking amps (EN)
- 825A
- Capacity (C20)
- 105Ah
Specific References
- MPN
- FDM12-825-M31
Recommended accessories
How to change the battery
Step-by-step guide to replace your car battery in 15-30 minutes (longer if the battery is under the seat or in the boot) without losing vehicle settings.
Step 1. Prepare the vehicle
Park on a flat surface, switch off the engine and remove the key. Make sure all lights and electrical accessories are off. Wait 1-2 minutes before starting.
Step 2. Locate the battery
Open the bonnet. The battery is usually in the engine bay, but in many modern cars it may be in the boot or under the passenger seat. Check the manual if you cannot find it.
Step 3. Disconnect the negative (−) terminal
Use the 10 mm wrench to loosen the negative cable nut (black, marked −) and remove the cable from the post. Move it aside so it cannot touch any bodywork.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Loosen the bottom hold-down clamp with the same wrench. Lift the battery carefully (it can weigh 15-25 kg). Clean the tray with a brush and baking soda if there is corrosion.
Step 6. Install the new battery
Place the battery in the same orientation as the old one (positive terminal on the same side). Tighten the hold-down clamp firmly.
Step 7. Connect the cables
Connect the positive (+) terminal first, then the negative (−). Tighten the nuts with the wrench until each terminal does not move. Apply anti-spark grease if you have any.
Step 8. Verify the engine starts
Close the bonnet. Start the engine to confirm everything works. On cars with Start-Stop or a BMS, you may need to register the battery via OBD so the alternator applies the correct charging profile.
Frequently asked questions
How do I fit the FDM12-825-M31 model in my car?
In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How long does the Fulbat FDM12-825-M31 battery last?
Expected lifespan of the Fulbat FDM12-825-M31 is 4 to 7 years in regular use (depends on technology and climate). In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the measurements of the FDM12-825-M31 model?
Dimensions (length × width × height) are 330×173×237 mm — also written as 330x173x237 mm — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
Which interchangeable batteries are there for this one?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level.
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