Mercedes-AMG - A-ClassMercedes-AMG A45 Battery Replacement in Dubai
A hot restart on a highly strung turbo four is the hardest thing a battery on this platform is ever asked to do, and the A45 does it constantly. Battery Zone UAE brings the high-output AGM this car needs rather than the one that merely fits, and codes it to the car before leaving.
Mercedes-AMG A45 at a Glance
- Battery type
- AGM
- Main battery
- 80Ah
- Cold cranking
- 800-840A EN
- Auxiliary battery
- 12V 13Ah AGM
- Coding
- Required
- Fitted in
- 20-30 min
High-output AGM. Nothing below this specification belongs here.
The largest unit the A-Class bay takes.
Cranking amps matter more on this car than capacity.
Separate unit, checked on every visit.
Registered to the battery management system after fitting.
At your location by a Battery Zone UAE technician.
Mercedes-AMG A45 by Generation
The name stayed the same, the electrical system did not. Find the years your car was built in and the differences that matter.
M133 2.0 turbo, up to 381hp and for a time the most powerful production four-cylinder made. Auxiliary battery usually under the passenger side floor beneath the carpet.
M139 2.0 turbo, up to 421hp in S trim, with a much heavier electronics package and a higher standing draw. Auxiliary placement varies by trim.
Cranking Amps Matter More Than Capacity Here
Most battery conversations turn on amp-hours, which measure how much charge a battery holds. On an A45 the number that decides whether you are going anywhere is cold cranking amps, which measure how hard it can push in the moment the starter turns.
The M133 and M139 are extraordinarily highly stressed engines. High compression, large turbochargers and tight tolerances all mean more resistance to overcome on start-up, and a hot restart in a Dubai August is harder again than a cold one, because heat-soaked oil and a hot engine bay work against you.
A battery whose capacity is still acceptable can have lost enough cranking ability to leave you stranded. That is why Battery Zone UAE load-tests an A45 battery rather than reading its resting voltage, and why we fit the high-output AGM rather than whatever is nominally the right size.
The A45 Duty Cycle Is Hard on Batteries
Not because anything is wrong with the car, but because of how these cars are actually used here.
Signs an A45 Battery Is Finished
On this car the giveaway is the warm restart, not the cold one, which catches a lot of owners out.
The engine cranks noticeably longer when hot than it does first thing in the morning
Start-stop stops engaging, which is the car declining to risk a restart it is not sure it can make
AMG drive mode, damper or 4MATIC warnings on start-up that clear once running
An auxiliary battery malfunction message, which refers to the small unit and not the main one
The car will not wake at all after two or three weeks parked
A battery older than two years on a car that lives outdoors
How Battery Zone UAE Handles an A45
Generation Confirmed
W176 or W177, because the M133 and M139 cars are not the same job and the auxiliary battery is not in the same place.
Load Tested Properly
Cranking performance measured under load rather than a voltage reading, which on this engine tells you very little.
High-Output AGM Fitted
The correct unit for the car, not the one that fits the tray, then coded to the battery management system.
Proven and Documented
Start-stop and drive modes confirmed live, warnings cleared, invoice and warranty issued, old unit taken for recycling.
If You Only Do One Thing
Put the car on a smart maintainer whenever it is going to stand for more than a couple of weeks. On an A45 this is not fussiness. It is the difference between a battery that reaches three years and one that dies in its second summer, and it costs a fraction of the battery it saves.
The second thing worth doing is having it tested before the season rather than during it. A battery that is marginal in March will be finished by July, and it is far cheaper to find that out in your own driveway than in a mall car park at midnight.
Battery Zone UAE tests free of charge, wherever the car happens to be.
What Drivers of This Model Say
“Mine would fire instantly cold and grind when hot, which three people told me was a starter motor. Battery Zone UAE load-tested it, showed me the drop and fitted the high-output AGM. Starts the same hot or cold now.”
“Second car, sits most of the summer, and every year it was dead by September. They fitted the right battery and told me to put a maintainer on it. First year I have not had to call anyone.”
“Called from a car park in Al Quoz on a Friday night expecting to wait until morning. Technician was there in about twenty minutes and had it coded and running before I finished my coffee.”
Mercedes-AMG A45 Battery Questions
A high-output AGM, typically 80Ah with 800A to 840A of cold cranking, plus the separate 12V 13Ah AGM auxiliary unit. On this engine the cranking figure matters more than the capacity, which is why Battery Zone UAE fits the high-output unit rather than the nominal size.
A high-compression turbo four is harder to turn over warm than cold, and a heat-soaked engine bay in Dubai makes it harder again. A battery that has lost cranking ability will show it on the warm restart first, which is why a car that starts perfectly at 6am can struggle at 3pm.
Not necessarily. AMG electronics draw while the car sits, so a month parked in Dubai will flatten a perfectly good battery. Battery Zone UAE tests it before recommending replacement, and if it recovers you have not bought something you did not need.
No. Different engines, different electronics and the auxiliary battery is not in the same place. We confirm which generation you have before the van is loaded.
Yes. The car sets its charging rate from what it believes about the battery, and without registration it keeps charging for the old one. Battery Zone UAE technicians code it at the roadside as part of the job.
Yes. Battery Zone UAE is a mobile service. A technician comes to your home, office, or wherever the car is parked, anywhere in Dubai, and the job takes 20 to 30 minutes.
Not Your Model?
We fit batteries across the whole Mercedes-Benz range, and the marque page lists every model we cover.
We Cover All Of Dubai
Mobile units are positioned across the city for the fastest possible response. We're closest to Business Bay and Downtown Dubai, with rapid coverage extending to Al Karama, Al Jaddaf, and offices, residential areas, and highways citywide.
A45 Struggling on the Hot Restart?
That is the first thing to go on this engine. Battery Zone UAE will load-test it where it stands, fit the correct high-output AGM if it needs one, and code it to the car before we leave. Across Dubai, 24 hours a day.
- Both batteries tested
- Coded to the car
- Old unit recycled