12v Battery Options - Which is the best? - Tesla Model S

[Steve]

Hi Battery Doctor

I am getting the 12v Battery needs service message, and am weighing my options.(Tesla Model S)

Which of the following have you tried and would recommend as a better option than just letting a Tesla ranger replace it.
Gruber Tesla Model S Battery: $185.76
High Capacity Dual Purpose AGM 12v Battery for Tesla Model S: $229.90


Thx, Steve

 

[Car Doctor]

Hi Steve,
Thank you for your question!

The “12V Battery Needs Service” message in your Tesla Model S is a common alert and indicates it’s time to replace the 12V auxiliary battery. Your decision on which replacement battery to choose depends on your priorities, such as cost, performance, longevity, and convenience. Let’s break down the options you mentioned:

Gruber Tesla Model S Battery ($185.76):

Pros:
Cost-effective option.
Tailored specifically for the Tesla Model S.
Comes from a reputable Tesla-specialized company.
Tested for compatibility with Tesla systems.

Cons:
Slightly lower capacity compared to some high-capacity alternatives.
May have a shorter lifespan if not rated for extended cycling.

High Capacity Dual Purpose AGM 12v Battery ($229.90):

Pros:
Higher capacity, which may handle more accessory loads and offer longer life.
AGM (Absorbent Glass Mat) technology is known for durability and reliability.
Dual-purpose design works well for vehicles with high electronic demands like Tesla.

Cons:
Higher price than the Gruber option.
May require minor modifications to fit perfectly, depending on the model year.

Key Factors to Consider:

Ease of Installation: Both options might need professional installation or at least resetting Tesla's battery management system (done via the touchscreen or a third-party tool).
Compatibility: Ensure the battery matches Tesla's specifications (size, voltage, and connections) and integrates well with the car’s battery management system.
Warranty and Support: Check which battery comes with better post-purchase support.

Recommendation:

If you’re comfortable doing the replacement yourself or hiring a local mechanic, the High Capacity AGM 12V Battery offers better durability and performance, especially if you drive frequently or rely heavily on auxiliary systems (e.g., media, climate controls). However, if you prioritize Tesla-specialized parts and are okay with a simpler solution, the Gruber Tesla Model S Battery is a cost-effective and reliable choice.

If you're unsure about the installation, Tesla's Ranger service is always the safest and most convenient, though it typically costs more.

Let me know if you need a step-by-step guide for replacing the battery!

Best,
Battery Doctor

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