Fulbat AUX12 · Auxiliary battery 12V 10.5Ah AGM
Specifications
| Brand | FULBAT |
|---|---|
| Part number | AUX12 |
| Voltage (V) | 12V |
| Capacity (C20) | 10.50Ah |
| Capacity (C10) | 10Ah (c10) |
| Technology | AGM |
| Length | 150mm |
| Width | 87mm |
| Height | 130mm |
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Polarity: positive on the left. Check it matches your current battery before buying.
Fulbat AUX12 12V 10Ah 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
10 Ah
Dimensions
150×87×130 mm
Technology
AGM
Polarity
Positive on the left
Model
FULBAT Auxiliary AGM
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Auxiliary battery Fulbat AUX12 10.5Ah 12V
12VVoltage
10.5AhCapacity
The Fulbat AUX12 with AGM technology is the 10.5 Ah, 12 V support battery for the auxiliary network of cars with advanced Start-Stop and heavy electronics. Measuring 150 × 87 × 130 mm and the positive terminal on the left, it is the direct replacement for vehicles with an auxiliary battery fitted from the factory with a 10.5 Ah battery of this format.
- Supports advanced Start-Stop systems.
- Direct replacement for the original auxiliary battery.
- AGM: faster recharging and better cycle resistance than a conventional battery.
- Protects the main battery and the alternator.
What the Fulbat AUX12 is for
The Fulbat AUX12 is designed for the auxiliary network of cars with advanced Start-Stop and heavy electronics: it stabilises the voltage and protects the main battery in cars with heavy electronics.
Will it fit your current battery tray?
It has external dimensions of 150 × 87 × 130 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. 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.
What Fulbat does differently
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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty.
Technology inside the Fulbat AUX12
Within the Fulbat catalogue, the AUX12 is the 10.5 Ah model designed for this application.
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.
Care and maintenance
Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both.
Warranty and coverage
The Fulbat AUX12 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.
Shipping, delivery 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-AUX12
Data sheet
- Brand
- FULBAT
- Model
- FULBAT Auxiliary AGM
- Voltage (V)
- 12V
- Length
- 150mm
- Width
- 87mm
- Height
- 130mm
- Technology
- AGM
- Terminal layout
- Positive left
- Capacity (C20)
- 10.50Ah
- Capacity (C10)
- 10Ah (c10)
Specific References
- MPN
- AUX12
Comparison: Fulbat AUX12 vs equivalents
The Fulbat AUX12 is interchangeable with these equivalent references: TK111 (Tudor), EK111 (Exide).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Fulbat
AUX12
This battery
|
|||
Tudor
TK111
|
12V 11Ah 150A | AGM | €169.70 |
Exide
EK111
|
12V 11Ah 150A | AGM | €33.60 |
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 is the Fulbat AUX12 battery installed in the vehicle?
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 AUX12 model?
Expected lifespan of the Fulbat AUX12 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 AUX12 model?
Dimensions (length × width × height) are 150×87×130 mm — also written as 150x87x130 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.
Is the AUX12 valid for my vehicle?
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 AUX12 typically fits a wide range of European vehicles thanks to its standard DIN case format.
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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