Battery

Tesla Battery Replacement Costs: The $40,000 Quote Was Two Quotes

“How many ‘Tesla battery replacement costs $40K’ articles are being written right now based on this misunderstanding?”

— r/TeslaModelS

That comment sits partway down a 267-comment thread. At the top of the thread is a photograph of a Tesla work order for a 2013 Model S, total just under $40,000, posted with the caption “Upgrading to a 90kw. Just under $40k out the door.”

The commenter was right to ask. That invoice is a large part of where the internet’s Tesla battery number comes from, and it is not a battery replacement price.

Your Tesla Battery Health Test Says 78%. OBD Says 73%. Which Is Right?

Here’s a question that comes up constantly in Tesla owner forums, almost word for word:

“Coming up on 200k km. Tesla’s battery health test says 78%, but the OBD data works out to about 73%. Where does the difference come from — and which one is right?”

It’s a good question, and the answer matters, because a five-point gap sounds like the difference between a healthy pack and one heading for trouble. So people panic. They shouldn’t — and the reason why is a nice illustration of the difference between a number and a measurement.

The Community-Verified Used Tesla Model S & X Buying Checklist (2026)

Two owners of the same car, same year, same spec:

“I have 42k miles on my 2017 X and in the last 6 months have paid about $4,000 in repairs… Car is turning into a pumpkin with such low miles.” — r/TeslaLounge

“Our 2017 with 125k on it has been perfect. Tires only.” — r/TeslaModelX

Both are telling the truth. A used Model S or X is not one gamble — it’s a stack of small, checkable facts, and almost every expensive surprise in the first story was visible before purchase if you knew where to look.

How to Check Your Tesla Battery Health in 2026

Your Tesla’s battery pack is the single most expensive component in the vehicle — worth $12,000 to $22,000 to replace. Yet Tesla gives owners surprisingly little visibility into its long-term health.

Here’s what you actually need to know.

What Tesla Shows You (And What It Doesn’t)

The built-in Tesla UI displays your current State of Charge (SOC) and estimated range. That’s it. There’s no:

• Cell-level voltage data
• Temperature spread between cells
• Degradation trend over time
• Isolation resistance readings
• Charge cycle count

These are the metrics that actually predict battery longevity — and Tesla keeps them locked behind the CAN bus.

Tesla Phantom Drain: Causes, Diagnosis, and How to Fix It

You wake up, check your Tesla app, and your car lost 8 miles of range overnight. It was parked in your garage, plugged in to nothing, doing… what exactly?

This is phantom drain — and it’s one of the most common Tesla owner complaints. Here’s what’s actually happening and what you can do about it.

What Is Phantom Drain?

Phantom drain (also called vampire drain) is the gradual loss of battery charge when your Tesla is parked and not in use. Every Tesla experiences some level of it — the car’s computers never fully shut down. But “normal” is 1–3 miles per day. Anything beyond that deserves investigation.

What's Normal Tesla Battery Degradation? Data from 100,000+ Vehicles

“My Tesla lost 15 miles of range in the first year — is that normal?”

This is probably the most common question in Tesla forums. The short answer: yes, probably. But let’s look at the data.

The figures in this article are drawn from published large-fleet degradation datasets — chiefly Geotab’s EV battery degradation study, Recurrent’s Tesla range reports, and Tesla’s own Impact Report — cross-referenced with owner-reported numbers on Tesla Motors Club and Reddit. They’re population averages: your individual pack depends on climate, charging habits, and configuration.