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You are here: Home / INDUSTRY NEWS / My 2017 Prius 228K Miles In, Mileage Dropped to 40 MPG, No Warning Lights, Now Toyota Says I Have to Replace the Hybrid Battery Pack
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My 2017 Prius 228K Miles In, Mileage Dropped to 40 MPG, No Warning Lights, Now Toyota Says I Have to Replace the Hybrid Battery Pack

02/10/2025

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Does shelf life or mileage kill a used Prius hybrid battery faster?

Tyler Long on the Toyota Prius Owners Facebook page says, 

“I have a 2017 Toyota Prius Touring 4 with the original factory lithium hybrid battery. The car has 228,000 miles on it, and lately, the fuel economy has dropped to around 40 MPG. There are no warning lights on the dash, but a scan of the battery system shows a P0A80 code, and now the Toyota dealer says I have to replace the hybrid battery pack.”

“I’m planning to replace it with a low-mileage pack from a wrecked vehicle. A local supplier has several options available, ranging from as low as 40,000 miles up to 123,000 miles. Some of these packs have been sitting in storage longer than others.”

“My question is: when choosing a replacement pack, is it better to go for the one with the lowest mileage, even if it’s been sitting for a while? Or should I aim for a balance—perhaps a slightly higher-mileage pack that hasn’t been idle as long? I’m unsure how much sitting on a shelf affects the health of these lithium packs.”

I saw Tyler Long’s post, and what he’s dealing with is what many Prius owners need to know about.

That P0A80 code—the dreaded “Replace Hybrid Battery Pack” flag—is a rite of passage for high-mileage Prius owners. Your 2017 Prius Touring 4 has given you a heroic 228,000 miles on the original lithium-ion pack, but the drop to 40 MPG is the real-world confirmation that your old friend is ready for retirement.

Tyler is wise to consider a salvaged pack, and his question about a replacement lithium-ion hybrid battery for a high-mileage Prius—specifically, the trade-off between low mileage and storage time—is one that many owners should ask.

Most Prius owners only think about the odometer, but the storage environment is a silent killer for lithium-ion technology.

My research reveals that the distinction between battery degradation over time versus cycles is critical for Toyota Prius owners, as it will save you time and money.

First, there are two primary enemies of a lithium-ion hybrid battery:

  • Cycle Aging (Mileage): This refers to the wear and tear resulting from charging and discharging cycles. Every mile driven in hybrid mode contributes to this, and this is what usually takes the battery out of commission in high-mileage applications like Tyler’s.
  • Calendar Aging (Shelf Life/Time): This refers to the chemical and internal degradation that occurs solely with the passage of time, regardless of use. It’s accelerated by two factors: high State of Charge (SOC) and high temperature. This is the critical factor when considering a battery that has been sitting in storage.

For Tyler’s 2017 Prius Touring 4 replacement battery choice, we’re looking at a lithium-ion (Li-ion) pack, which is fundamentally different from the older NiMH batteries in the earlier Prius. Li-ion chemistry is more sensitive to sitting idle, especially if stored improperly.

The “Lowest-Mileage” Battery That Sat Too Long

The instinct to grab the 40,000-mile pack is strong—it seems like a no-brainer—but it’s often a trap. Here is what experts say about how sitting affects the Toyota Prius lithium-ion hybrid battery health:

  • Deep Discharge Damage: If a lithium pack sits unused for an extended period, its internal self-discharge can cause it to fall into a deep discharge state. Once the individual cells drop below a certain voltage threshold (typically 2.5V per cell, though Toyota manages the pack differently), it can cause permanent, irreversible damage to the cell’s internal structure.

This significantly reduces its ability to hold a charge and its overall lifespan. A pack that was drained before storage or left for a year without maintenance charging can be toast, even if it has minimal miles.

Anode Film Growth (Calendar Aging): Even at a “safe” storage charge (ideally 50%−60% SOC), the battery still ages. A phenomenon called Solid Electrolyte Interphase (SEI) layer growth occurs, consuming cyclable lithium and increasing internal resistance. This process is proportional to the square root of time (t) and is accelerated by high temperatures and high SOC. A pack from a hot climate, stored at 100% charge for a long time, will have significant calendar degradation.

So, What’s the Answer? Aim for Balance

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Tyler’s answer lies not in the extremes, but in the middle ground. The better choice is to target the pack that offers the best blend of low cycle count and minimal calendar aging.

What Should Owners Do? Ask Your Supplier These Three Key Questions

To make an educated choice and secure the optimal used lithium hybrid battery for your Prius, here are the expert recommendations.

  • Prioritize the Low-Mileage Pack, BUT Demand Data: The 40,000-mile pack is a good starting point, but you must overcome the ‘sitting’ risk. Ask the supplier for a diagnostic report. They should be able to provide the State of Health (SOH) and Delta SOC (the difference in State of Charge between the highest and lowest cell block).
  • An SOH over 85% and a tight Delta SOC (ideally less than 1%) is the goal. A great battery with low miles will have a great report card, even after sitting.
  • Inquire About Storage Conditions: Ask where and how long the packs were stored. The best-case scenario is a pack that was pulled and stored in a cool, dry, temperature-controlled environment (such as a basement or a cool warehouse), ideally at 50%- 60% State of Charge. 
  •  

A pack that’s been in the back of a scrapyard in the Arizona sun for two years is a hard pass, regardless of its low mileage. The higher-mileage, recently removed pack that has not been sitting as long might be a safer bet than the low-mileage pack that sat in improper conditions.

Go with the one with the Lowest Mileage, if it passes the “Sit” Test. If the 40,000-mile pack has been sitting for less than a year, or if it was stored correctly and the diagnostic report is clean, it is overwhelmingly the superior choice. The number of charge/discharge cycles (mileage) is a permanent structural loss. The calendar aging from sitting can be minimal if the pack was managed correctly.

Rule of Thumb for Your Decision:

Lowest Miles (40k) + Good Diagnostic Report/Short Storage Time (<1 Year): BUY THIS ONE. This is the Holy Grail: minimal cycle fatigue and minimal calendar aging.

Medium Miles (e.g., 80k) + Known Recent Removal/Great Diagnostic: A strong second choice. You accept more cycle wear for a near-zero risk of deep-discharge damage.

Lowest Miles (40k) + Unknown/Long Improper Storage (>2 Years): DANGER, AVOID. The risk of permanent cell damage is too high. This is the definition of assessing salvaged Toyota Prius battery health.

What Now?

For all you high-mileage Prius owners facing the same P0A80 code 2017 Prius hybrid battery replacement, here are the takeaways:

  • Don’t Ignore the Code: Your 40 MPG is the proof—the code is legitimate. The weak block(s) can’t hold their voltage, forcing the car to use more gasoline and reducing your Toyota Prius’ fuel economy.
  • Refurbished vs. Used: A professionally refurbished pack is an alternative, but insist they replace all weak cells, not just the one that threw the code. A good used pack from a low-mileage wreck (a “virgin” pack) is often the best value and performance, provided it was stored correctly.
  • Demand a Scan Tool Report: Any reputable supplier of used hybrid batteries should be able to provide the diagnostic data showing the health of the individual cell blocks. No report? Walk away. You’re buying a pig in a poke.
  • Protect Your Replacement: Once installed, drive your car regularly! Hybrid batteries thrive on regular use, as the car’s computer constantly keeps them within their optimal 40%- 80% State of Charge window. This prevents the calendar-aging decay that occurs in used, low-mileage hybrid batteries when they are stored.

Conclusion:

Tyler’s situation is a perfect illustration of doing your homework before buying a used Prius or when you need a hybrid battery replacement.

Now, It’s Your Turn

If you had to choose between a 50,000-mile used hybrid battery that sat for three years in an unconditioned warehouse or a 100,000-mile used battery pulled just three months ago, which one would you choose and why? Let me know in the comments below!

Check out my Toyota RAV4 Hybrid/Prius story: One Year and 15K Miles In, My 2024 Toyota RAV4 Hybrid XLE Is a Keeper, It’s Better Than the Prius Wagon It Replaced

I am Denis Flierl, a Senior Torque News Reporter since 2012. My 30+ year tenure in the automotive industry, initially in a consulting role with every major car brand and later as a freelance journalist test-driving new vehicles, has equipped me with a wealth of knowledge. I specialize in reporting the latest automotive news, covering owner stories, and providing expert analysis, ensuring that you are always well-informed and up-to-date. Follow me on X @DenisFlierl, @WorldsCoolestRides, Facebook, and Instagram

Photo credit: Denis Flierl via Tyler Long

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Source: torquenews.com

Filed Under: INDUSTRY NEWS Tagged With: Source-16

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