United States · Battery knowledge hub
Tesla vehicles do not have a starter battery in the conventional sense. A low-voltage battery powers control electronics; older vehicles used a 12V lead-acid unit, while newer vehicles moved to a lithium-ion low-voltage battery.
Service note: We confirm before any visit whether your Tesla’s low-voltage battery is a part we can service. If not, we will say so and suggest contacting Tesla service.
Select a model for generation-level battery notes
A failing low-voltage battery can prevent a Tesla from waking or opening normally, even if the high-voltage pack is charged.
Some electric and newer premium vehicles use a lithium-ion low-voltage battery for control electronics rather than a lead-acid starter battery. These are vehicle-specific parts, not general replacements.
Replacement rule: Only the manufacturer-specified part should be used. Lead-acid batteries are not a substitute unless the manufacturer documents it for that vehicle.
Read the Li-ion low-voltage guide →Electrolyte is held in glass-fibre mats between the plates. AGM batteries tolerate frequent deep cycling and high electrical loads, which is why they are fitted to many premium and start-stop vehicles with brake-energy recovery.
Replacement rule: A vehicle designed for AGM should be fitted with AGM. A flooded or EFB battery in its place is likely to wear out quickly and may trigger charging-system faults.
Read the AGM guide →Generation-level information from our vehicle database. Where a field says “confirm”, it varies by engine or trim and is checked against your vehicle.
Whether your car uses a lead-acid or lithium-ion low-voltage battery depends on the model and build date.
We can assist with testing and with lead-acid low-voltage batteries where appropriate. Lithium-ion low-voltage batteries are usually replaced by the manufacturer.
For vehicles with a lead-acid low-voltage battery, often yes. Vehicles with a lithium-ion low-voltage battery generally need Tesla service. We confirm before booking.
A weak low-voltage battery is a common cause. Tesla also provides procedures for powering the car when it will not wake; check your owner’s manual or contact Tesla.
Tell us the model and year, and send a photo of the current battery if you can. We confirm the right battery before anyone sets off.
Daily, including late evenings. Out-of-hours requests are answered as technician availability allows.