Fulbat AUX14-J · Auxiliary battery 12V 14Ah AGM
Specifications
| Brand | FULBAT |
|---|---|
| Part number | AUX14-J |
| Voltage (V) | 12V |
| Capacity (C20) | 14Ah |
| Capacity (C10) | 12Ah (c10) |
| Technology | AGM |
| Length | 150mm |
| Width | 87mm |
| Height | 145mm |
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Polarity: positive on the left. Check it matches your current battery before buying.
Fulbat AUX14-J 12V 14Ah is an AGM support battery designed for daily cycling while keeping voltage stable for the vehicle systems.
Why this auxiliary battery?
- Designed for Start-Stopbuilt for the intensive cycling of modern cars
- 2 to 3 times longer lifevs fitting a cheap conventional battery
- Fast recoveryrecharges in minutes once the engine is running
Voltage
12 V
Capacity
14 Ah
Dimensions
150×87×145 mm
Technology
AGM
Polarity
Positive on the left
Model
FULBAT Auxiliary AGM
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Auxiliary battery Fulbat AUX14-J 14Ah 12V
12VVoltage
14AhCapacity
The 12 V, 14 Ah Fulbat AUX14-J auxiliary battery with AGM technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. Its 150 × 87 × 145 mm and the positive terminal on the left make it the exact replacement for the 14 Ah battery fitted as standard to many vehicles with an auxiliary battery.
- Protects the main battery and the alternator.
- AGM: faster recharging and better cycle resistance than a conventional battery.
- Direct replacement for the original auxiliary battery.
- Supports advanced Start-Stop systems.
What the Fulbat AUX14-J is for
With 14 Ah, the Fulbat AUX14-J is the direct replacement for the original auxiliary battery in the auxiliary network of cars with advanced Start-Stop and heavy electronics.
Dimensions, polarity and mounting
The Fulbat AUX14-J is made in the 150 × 87 × 145 mm format. 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. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters.
Why choose Fulbat batteries
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 AUX14-J
Within the Fulbat catalogue, the AUX14-J is the 14 Ah model designed for this application.
AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery.
Care and maintenance
Replace it with the same technology and capacity as the original. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators.
Official warranty
The Fulbat AUX14-J comes with the manufacturer's official warranty against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you.
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.
BCOM-FULBAT-AUX14-J
Data sheet
- Brand
- FULBAT
- Model
- FULBAT Auxiliary AGM
- Voltage (V)
- 12V
- Length
- 150mm
- Width
- 87mm
- Height
- 145mm
- Technology
- AGM
- Terminal layout
- Positive left
- Capacity (C20)
- 14Ah
- Capacity (C10)
- 12Ah (c10)
Specific References
- MPN
- AUX14-J
Comparison: Fulbat AUX14-J vs equivalents
The Fulbat AUX14-J is interchangeable with these equivalent references: TK151 (Tudor), EK151 (Exide).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fulbat
AUX14-J
This battery
|
|||
Tudor
TK151
|
12V 15Ah 200A | AGM | €64.95 |
Exide
EK151
|
12V 15Ah 200A | AGM | €54.60 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
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 AUX14-J 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.
What is the service life of the AUX14-J model?
Expected lifespan of the Fulbat AUX14-J 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 AUX14-J model?
Dimensions (length × width × height) are 150×87×145 mm — also written as 150x87x145 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.
Does this battery fit my car?
Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The AUX14-J typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Fulbat AUX14-J?
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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