Fulbat FTX4L-BS / FTZ5S-BS · Motorcycle battery 12V 4.2Ah 50A AGM
Specifications
| Brand | FULBAT |
|---|---|
| Part number | FTX4L-BS / FTZ5S-BS |
| Voltage (V) | 12V |
| Capacity (C20) | 4.20Ah |
| Capacity (C10) | 4Ah (c10) |
| Technology | AGM |
| Length | 113mm |
| Width | 70mm |
| Height | 85mm |
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Fulbat FTX4L-BS / FTZ5S-BS 12V 4,2Ah 50A is a motorcycle starter battery with standard JIS code (the one on your bike's original label). Ready to use, sealed and vibration-resistant. Fits any model that takes the same JIS reference — the code your mechanic recognises at a glance.
Why this motorcycle battery?
- Same JIS referenceas your bike's original — fits first time
- Sealed and ready to useno acid handling, no refills
- Survives winter storageholds charge through long off-season
Voltage
12 V
Capacity
4,2 Ah
Cold cranking
50 A
Dimensions
113×70×85 mm
Technology
AGM
Polarity
Positive on the right
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Motorcycle battery Fulbat FTX4L-BS / FTZ5S-BS 4.2Ah 50A 12V
12VVoltage
4.2AhCapacity
50ACold cranking
The Fulbat FTX4L-BS / FTZ5S-BS motorcycle battery is rated at 12 V, 4.2 Ah and 50 A of cold cranking current (EN), and is designed for motorcycles, scooters, quads and personal watercraft. Its 113 × 70 × 85 mm and the positive terminal on the right make it the exact replacement for the 4.2 Ah battery fitted as standard to many motorcycles.
- Compact and lightweight format.
- Holds its charge through winter storage.
- Sealed and ready to fit, no acid handling.
- AGM: faster recharging and better cycle resistance than a conventional battery.
What the Fulbat FTX4L-BS / FTZ5S-BS is for
With 4.2 Ah, the Fulbat FTX4L-BS / FTZ5S-BS covers the starting of motorcycles, scooters, quads and personal watercraft. The JIS code on your current battery label is the safest way to confirm equivalence.
Will it fit your current battery tray?
The Fulbat FTX4L-BS / FTZ5S-BS is made in the 113 × 70 × 85 mm format. The positive terminal on the right 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.
Technology inside the Fulbat FTX4L-BS / FTZ5S-BS
Fulbat builds the FTX4L-BS / FTZ5S-BS to the same standards as the rest of its catalogue; what changes between references is capacity, format and terminal position.
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.
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. We guarantee that every Fulbat arrives new, charged and with the manufacturer's full warranty.
Manufacturer's warranty
The Fulbat FTX4L-BS / FTZ5S-BS comes with the manufacturer's official warranty. The warranty does not cover discharge through prolonged inactivity: if the bike stands for months, use a trickle charger.
Usage and maintenance tips
If the bike spends the winter standing, connect a trickle charger: deep discharge through inactivity is the first cause of premature failure. Check the resting voltage before the season (above 12.6 V on a charged battery) and make sure the terminals are clean and tight.
When you get it and how to return it
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-FTX4L-BS / FTZ5S-BS
Data sheet
- Brand
- FULBAT
- Model
- FULBAT Motorcycle MF
- Voltage (V)
- 12V
- Length
- 113mm
- Width
- 70mm
- Height
- 85mm
- Technology
- AGM
- Terminal layout
- Positive right
- Cold cranking amps (EN)
- 50A
- Capacity (C20)
- 4.20Ah
- Capacity (C10)
- 4Ah (c10)
Specific References
- MPN
- FTX4L-BS / FTZ5S-BS
Recommended accessories
How to change the battery
Guide to replace your motorcycle battery in 10-15 minutes. Motorcycle batteries are light (2-5 kg) and usually need an 8 mm wrench.
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 compartment
On motorcycles it is usually under the seat, in the rear cowl or behind a side panel. Check the manual — access varies a lot between models.
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 hold-down clamp or the straps that secure it. Lift the battery carefully — typical weight 2-5 kg. Check the terminals are not corroded before fitting the new one.
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 FTX4L-BS / FTZ5S-BS battery installed in the vehicle?
In most motorcycles 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 motorcycles with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How long does the Fulbat FTX4L-BS / FTZ5S-BS battery last?
Expected lifespan of the Fulbat FTX4L-BS / FTZ5S-BS 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 dimensions of the Fulbat FTX4L-BS / FTZ5S-BS battery?
Dimensions (length × width × height) are 113×70×85 mm — also written as 113x70x85 mm — following the European DIN standard. Always measure the space in your motorcycle before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
Is the FTX4L-BS / FTZ5S-BS 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 FTX4L-BS / FTZ5S-BS typically fits a wide range of European vehicles thanks to its standard DIN case format.
Which batteries are equivalent to the Fulbat FTX4L-BS / FTZ5S-BS?
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 motorcycles. See the "Equivalents" section to view recommended options at the same performance level.
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