Tesla 12V and high voltage battery service in Auckland
A Tesla that will not wake up, throws warnings at random or drops accessories is nearly always the small battery, not the big one. We replace 12V and lithium low voltage batteries, and check high voltage battery health properly.
Every model, including the lithium low voltage batteries on later cars.
What we do
Two batteries doing two very different jobs. The small one runs the car electronics and fails like any other battery. The big one rarely fails, but owners want to know where it stands.
Car not waking up?
It is usually the low voltage battery, and it is usually a quick fix. Book it in and we will test it rather than guess at it.
Most Tesla battery problems are the 12V
Every Tesla carries a small low voltage battery alongside the traction pack. It runs the screens, the locks, the contactors and everything that has to work before the high voltage system will come online. When it starts failing, the car behaves as though something far more serious is wrong.
The symptoms look random. Doors that will not unlock, a screen that will not come up, warnings that appear and clear on their own, charging that stops overnight. Earlier cars use a conventional lead-acid battery that lasts a few years. Later cars use a lithium unit that lasts longer but still ends up in the same place.
Replacement is straightforward and we register the new battery to the car so it charges correctly. The high voltage pack is a different story. Those rarely fail, and what owners usually want is a health check and an honest read on the numbers.
A certified Aviloo report on your high voltage battery
The battery is the most valuable part of the car and the hardest to judge from the driver's seat. The estimate on your screen is not a measurement, and range varies with weather, driving and charging habits enough to hide a real problem or invent one that is not there.
We test the pack independently and give you an Aviloo report: an independent, manufacturer-neutral assessment of what your battery is actually doing, in a document you can keep, hand to a buyer or take to a warranty claim.
Available as part of a routine service, or on its own as a full high voltage battery inspection.
Aviloo is an independent battery diagnostics company. The test runs on your car's own data rather than a manufacturer's estimate, and the report is neutral — it is not written by us and not written by Tesla.
When it is worth doing
Before you buy a used Tesla, before you sell one, when the range has changed and you want to know whether that is the battery or the winter, and when a warranty claim needs evidence rather than an opinion. It is also worth having a baseline on the car while everything is healthy, so the next test has something to compare against.
How it works here
Book it with a service or on its own. We fit the test device, the car records its data over a normal charge and discharge, and the report comes back certified. We then sit down and go through it with you in plain language rather than handing over a PDF and leaving you to interpret it.
Book a battery report
Everything else we do
One workshop in Penrose for the whole car, every model. Genuine Tesla or quality aftermarket parts — your choice, quoted before it starts.
Battery questions
Amazing service. The car hit a spot of bother, and I rang them and they sorted me out incredibly quickly. Gave me a loan car and sourced the parts and fixed it. No hassle and really nice to deal with.
Book your Tesla in
Pick a day and whether morning or afternoon suits. We'll come back to you within the hour during business hours to confirm your time.