Varta Battery ReplacementClarios · GermanyView brandBackup and 12V System Batteries
Auxiliary Battery Replacement in Dubai for Hybrids and Luxury Cars
Many newer cars carry a second, smaller battery beside the one that starts the engine. In a Mercedes it keeps the electronics alive when stop-start cuts the engine; in a Toyota hybrid it is the 12V unit that wakes the whole system. When it weakens you get warning lights, not a flat car. We diagnose which unit is at fault and fit the right one in 20–30 minutes.
What a Second Battery Actually Does
A backup or support battery sits apart from the main car battery and is there to:
- Keep control units and memory powered while the engine is off
- Hold the voltage steady during stop-start restarts
- Feed driver-assistance systems a clean, stable supply
- Boot a hybrid's high-voltage system, where the 12V unit does not crank an engine at all
Most are AGM, and the car's own power management decides when each one charges. That is why a fault can hide behind a perfectly healthy starter battery.
Why drivers call us
Why Owners Call Us for This Job
Replacing a support battery is small work that has to be done correctly. What we bring to it:
- Branded Units OnlyBackup batteries from established makers, matched to the part your car's manufacturer specifies.
- At Your AddressHome, office or roadside, with the swap done in 20–30 minutes once we arrive.
- Proper DiagnosisVoltage and load tests on both batteries, plus a fault-code read, before anything is recommended.
- Clear Price, Real WarrantyPricing is agreed ahead of the visit, and the new unit is covered for 12–24 months.
- Any HourWarning lights do not keep office hours, and neither do we.
Cars That Commonly Have One
You are likely to own one if you drive:
- A Mercedes-Benz with a backup battery, such as many E-Class and S-Class models
- A Toyota or Lexus hybrid, such as the Prius or Camry Hybrid, where the 12V unit is officially called the auxiliary battery
- A car with an electric parking brake, advanced driver assistance or a large infotainment system
- An electric car or plug-in hybrid with a separate 12V system battery, such as the Nissan Leaf
- A start-stop SUV from a maker that uses a dual-battery layout, including some Land Rover models
Why drivers call us
Booking in Five Short Steps
Most customers are sorted within the hour:
Phone or WhatsApp
Open 24/7.
Tell Us the Car
Make, model and year.
Hear the Price
Quoted up front, nothing added.
We Come to You
With the correct part on board.
Fit and Verify
Installed and tested in under an hour.
Why drivers call us
What the Service Covers
One visit handles the diagnosis, the part and the follow-up:
Testing and Fault Codes
A multimeter, a load tester and a scan tool show which battery is weak and whether the charging circuit is working.
The Swap Itself
The old unit is disconnected in the right order, the new one is secured, and the warning is cleared once the readings are normal.
Done Where You Are
No tow truck and no dealer appointment. The technician works in your car park or driveway.
Brands We Fit
Varta, Bosch, Amaron, ACDelco, Solite and Delkor, subject to the size your car needs.
Keeping the Backup Unit Healthy
- Plan on a change every 3–4 years, sooner on cars with heavy electrical loads.
- Use a smart maintainer if the car will stand for several weeks.
- Replace AGM with AGM. A flooded unit in that position will fail early.
- Keep software updates current; some drain faults are fixed that way.
- On a dual-battery car, always have both batteries tested together.
Batteries we fit
Related batteries on the van
Varta Battery ReplacementClarios · GermanyView brand
Bosch Battery ReplacementGerman Engineering · S3 to S6View brand
Optima Battery ReplacementClarios · SpiralCell AGMView brand
Yuasa Battery ReplacementJapan · Merged 2004View brand
Panasonic Battery ReplacementJapan · JP Series and caosView brand
Delkor Battery ReplacementClarios Delkor · Gumi, South KoreaView brandWhat we do
More help on the same number
- 01Alternator & Dynamo RepairCharging System Repair
- 02Car JumpstartFlat Battery Rescue
- 03Roadside AssistanceBreakdown Help
- 04Car TowingFlatbed Towing
FAQ
Questions about Auxiliary Batteries
The main unit cranks the engine. The support unit keeps electronics, safety systems and memory powered, and on a hybrid it starts the high-voltage system.
Usually 3–4 years, depending on the car and how it is used.
Often, yes, but stop-start, driver aids or the infotainment may stop working and warnings will keep appearing. Get it tested soon.
Yes, if it was built with one. The electronics are designed around that supply.
Between AED 300 and AED 850, depending on the make, the capacity and the car.
Yes. We cover the whole city with mobile technicians.
No. Most are AGM and must match the manufacturer's specification, or they fail early and the car may log faults.
Varta, Amaron, Delkor, ACDelco and Bosch, among others.
Warning messages, stop-start that stops working, electronics resetting, or a hybrid that will not switch to ready.
Yes. The 12V unit in a Toyota or Lexus hybrid is officially called the auxiliary battery, and a flat one stops the car from starting.
Always. Both batteries and the charging system are checked first.
Yes, including BMW, Audi, Mercedes-Benz and Porsche.
Typically 20–30 minutes within the city.
Yes. Most units carry 12 to 24 months.
From the field
Recent call-outs across Dubai
Where we work
Every Part of Dubai, Covered
Our vans work from points spread across the city, so the one nearest you is sent. Response is quickest around Business Bay and Downtown Dubai, and just as dependable out to Al Karama, Al Jaddaf and every home, office district and highway in between.
Al QusaisAl BarshaJumeirahJBRMarinaDowntownBusiness BayDubai Silicon OasisAl WarsanDIPSports CityStudio CityMotor CityArabian RanchesUmm SuqeimNad Al HamarDubai LandJLTDiscovery GardensSprings 7MirdifAl FurjanPalm JumeirahAl SufouhGlobal VillageJAVArjanBarsha HeightsEmirates HillsThe LakesSilicon OasisAl BarariBur DubaiMeydanMajanAl WaslSobhaAl KaramaDubai SouthAbu HailAl JaddafAl RaffaAl RiggaDubai Airport
Open 24/7, anywhere in Dubai
Warning Light On? Let Us Look
Whether it is a hybrid that will not wake up or a Mercedes showing a backup battery fault, the right part is on the van.
Call us for a diagnosis and a firm quote.
Book a time or ask us to come now, and we will work wherever the car is parked.