Toyota · 2013–2022 (US)
Toyota Avalon Hybrid battery service
Toyota Avalon Hybrid battery repair and replacement across the Phoenix metro. The Avalon Hybrid uses the 34-module, 244.8V nickel-metal hydride pack shared with the Camry Hybrid of the same era, mounted in the trunk.

Toyota Avalon hybrid battery at a glance
- Battery type
- Nickel-metal hydride on most model years; confirm newer cars by VIN
Get a price for your Toyota Avalon Hybrid
Pick what you need and how to reach you. You get a written quote before anything is ordered.
Symptoms Avalon Hybrid owners report
- Fuel economy dropping steadily over a few months — usually the first sign on this car.
- The engine running at stops where it used to shut off.
- Reduced power merging onto a freeway.
- Fan noise from the rear parcel area.
- A hybrid system warning light.
Repair or replace
- A few weak modules with the rest grouped tightly: module-level repair.
- A widening spread across the 34: replacement.
- We measure every module and show you the numbers before recommending either.
- The 12V battery is tested first, and the cooling intake in the rear seat area is checked for blockage.
Prices and fitment for the Toyota Avalon Hybrid
- Toyota Avalon Hybrid Battery (2013–2018) — from $1,449
Toyota Avalon hybrid battery questions
Is the Avalon Hybrid battery the same as a Camry Hybrid?
My Avalon sits for months while I'm out of state. Does that hurt the battery?
Recently published
Latest from the blog
- Symptoms5 min read
Hot or Chemical Smell From a Hybrid's Back Seat: What to Do
A hot or sulfur smell behind the rear seat usually means overheating modules or vented electrolyte. What to do now, and what the repair costs.
- Diagnostics5 min read
Hybrid Battery or Inverter? 5 Tests That Tell Them Apart
Five data points separate a failing hybrid battery from a failing inverter: block voltage spread, SOC swing, codes, coolant flow and heat behavior.
- Diagnostics5 min read
Can a Phone OBD2 App Tell You If Your Hybrid Battery Is Bad?
A $20 dongle and the right app shows all 14 Prius block voltages — but not internal resistance or capacity. How to read what you get at home.
Not sure what your hybrid needs? We'll work it out with you.
We come to you, test the pack, the 12V and the cooling, and you get a written quote before anything is decided. No obligation.