Hybrid battery failing: fix it or sell the car?

There's a middle road too. A refurbished or used pack costs less than a new one, and on an older car it can be the sensible repair.

Start with the warranty, not the repair quote

Battery coverage depends on the maker and the model year, so read your own warranty booklet or ask a dealer with the VIN in hand. Toyota is the clearest example in our sources.

• Toyota, model year 2020 and newer. Toyota covers every Toyota Hybrid battery for 10 years or 150,000 miles, whichever arrives first.
• Older Toyotas. The 2020 change raised the battery term from 8 years/100,000 miles. Plug-in and fuel cell models got it as well as regular hybrids, so a plug-in hybrid from 2020 on gets the longer term too.
• The rest of the high-voltage system. Toyota keeps its other high-voltage parts under the Hybrid System Warranty at 8 years/100,000 miles. On an older hybrid, the battery warranty can be over while the rest of the system is still covered. Or both can be gone.

Federal law adds a floor of its own, but don't read too much into it. 42 U.S.C. 7541 sets the warranty on specified major emission-control parts at 8 years or 80,000 miles, and the EPA rule (40 CFR 85.2107) says the maker must repair or replace those parts until then. That is a rule for listed emission parts. It isn't a hybrid battery term, so ask the maker whether your pack falls under it before you count on it.

Other brands set their own terms. Our sources don't cover them, so the dealer is the place to ask.

What a new pack costs, and the cheaper options

AAA's figure for a replacement hybrid traction battery is about $4,000 to $5,000. Three things to know before you take a quote:

1. It can't be topped up. AAA says a failing hybrid battery can't be recharged back to health. The usual fix is a new pack.
2. Some newer cars can be fixed cell by cell. In newer vehicles, AAA says, failing cells can sometimes be swapped out one module at a time, which can cost less than a whole pack.
3. Refurbished and used packs exist. These often come out of damaged or end-of-life cars. AAA calls them a lower-cost option that can make sense for older cars.

Get the quote in writing and ask which of these the shop is pricing.

How long a pack is expected to last

AAA says hybrid batteries can safely last about 100,000 to 150,000 miles. So a pack that quits near the top of that range hasn't failed early, and a used pack pulled from a car with similar miles may not have many years left in it either. Ask the seller of any used pack how many miles it came off at.

Running the numbers

Put three figures side by side:

• what the car is worth running, with a healthy battery
• what it would take to get it there: new pack, refurbished pack, or a module repair
• what the car brings as it sits today, battery dead

If the repair plus what you'd get today comes close to the running value, fixing it buys you very little. If the car is newer, low in miles and worth far more than the pack, the repair usually pays. Our repair costs more than value guide walks through the same math for any fault.

A hybrid that won't go into Ready isn't always a dead battery. Have a shop confirm what failed before you price a pack, since that's the number everything else hangs on.

Selling a hybrid with a dead pack

You don't have to fix it first. A buyer for a non-running car prices it with the fault in mind, so the main job is to be clear:

• the year, make, model and mileage
• what the car does now, and what a shop said is wrong
• whether any battery or hybrid system warranty is left
• whether the pack has been opened or worked on

Leave the battery in the car when you sell it whole. Federal rules treat a battery as "one or more electrically connected electrochemical cells" (40 CFR 273.9), and the EPA's universal waste program lists batteries as one of its five categories. Shops that manage them as universal waste can usually store them for a year and don't need a hazardous-waste manifest or transporter.

The handling rules are strict. Under 40 CFR 273.13, a small quantity handler must put a battery that shows leaks, spills or damage in a "closed, structurally sound container", and may sort, discharge or regenerate batteries only while each cell casing stays intact and closed. If you sell the whole car, the pack stays in it and you never handle it yourself. The part it out or sell whole guide covers the trade-off for other parts.

Emissions tests, state by state

If someone plans to fix the car and register it, the emissions rules where it gets registered still apply. A few states name hybrids directly: Nevada exempts hybrids for five model years, Ohio's E-Check includes hybrids without a plug, and Wisconsin's test covers hybrids. In California, a car sold so it can be dismantled or junked needs no smog certificate (California DMV).

When fixing makes sense, and when selling does

Fix it when the pack is under warranty, when the car is newer with low miles, or when a module repair or refurbished pack brings the bill well under what the running car is worth. In those cases you keep a car that likely has years left.

Sell it when the warranty is gone, the miles are high, and a new pack would cost close to what the car is worth after the work. Sell it too if the shop finds other high-voltage parts failing, since each one adds to the bill. A non-running car can still be sold without a dollar spent on it.

Selling it to us

We buy whole non-running and junk cars. You can sell the whole car as it sits, dead pack and all, with free pickup anywhere in the US. For an offer, let us know what the car does, what the shop found, and whether the battery has been touched.

Questions first? Call (877) 421-6008.