Subaru Key Fob Battery Replacement: Smart Remotes and Older Keys

Why Subaru Key Fobs Stop Working

Subaru smart fobs typically run out of juice after two to four years. You’ll usually notice it when you have to stand awkwardly close to the car to get the doors to pop, or when the dashboard throws a low-battery warning.

In almost every case, the fob itself is fine, it just needs a fresh coin cell.

The usual suspect is a drained CR2032 in the newer push-to-start fobs, or a CR1620 if you’re driving an older model with a fold-out metal key.

These lithium cells power the radio signal talking to your car’s receiver, and their voltage naturally drops over time until the signal gets too weak. Leaving the fob in a hot glovebox during summer or a freezing driveway in winter speeds up that drain.

Smart fobs also sip power constantly while sitting idle, unlike old-school keys. If you find yourself pressing the unlock button three times instead of once, the battery is already on its way out.

What You Need Before Starting

Replacing the battery requires the correct cell, a pry tool, and patience. The wrong battery type or rough handling can damage the fob. Check compatibility first to avoid wasted purchases.

A flathead screwdriver or plastic pry tool can open the fob, but dedicated kits often include a safer, non-scratching tool. Some packs bundle batteries with these tools, which simplifies the process. Avoid metal tools that can scratch the casing or damage the circuit board.

Work on a clean, flat surface to prevent losing small parts. If your fob has a visible seam, that’s usually the starting point for prying. Always note the battery’s orientation before removal to ensure correct reinstallation.

Premium CR2032 batteries with a fitment guide confirm compatibility for 2015-2025 Subaru smart fobs.

This two-pack targets 2015-2025 Subaru smart fobs, covering everyday drivers like the Outback, Forester, and WRX. My read is that the most useful feature here is the fitment guide tucked into the product images, you should absolutely check that before buying to ensure your specific fob shape matches.

There’s no programming involved; you just pop the old cell out and drop the new one in. They’re listed as OEM-grade, which generally means consistent voltage output.

I’d point this toward someone who already owns a small plastic pry tool or doesn’t mind using a fingernail on a loose seam. Since there are no tools included, first-timers might feel slightly exposed, but the written guide in the listing description walks through the steps clearly.

Having a second battery in the drawer is a nice safety net for when the next one dies in a few years.

CR2032 batteries with DIY instructions and compatibility for 2015-2025 Subaru smart fobs.

Here’s another CR2032 twin-pack aimed at 2015-2025 smart fobs, including the Ascent, Impreza, and Legacy. What stands out to me is the focus on step-by-step written instructions rather than relying solely on external videos. No reprogramming is needed, which keeps this strictly a mechanical swap.

They’re marketed as premium cells, aiming for a longer lifespan than generic bulk batteries.

If you prefer reading a quick guide over pausing and rewinding a video, this setup makes sense. You will need to source your own opening tool, which is a minor hassle if your kitchen junk drawer doesn’t have a flathead screwdriver small enough to do the job safely.

Still, the explicit compatibility list removes the guesswork, and keeping the spare battery sealed until you need it preserves its charge.

CR2032 batteries with pry tools and video instructions for Subaru smart fobs.

This five-piece bundle from uuam changes the math by including three plastic pry tools alongside the two CR2032 batteries. It covers 2015-2025 smart fobs, and having dedicated non-marring tools means you’re far less likely to chew up the edges of your key shell.

They also provide access to installation videos, which I think is crucial if you’ve never opened a fob before. The batteries themselves match OEM specs.

I would recommend this specifically for anyone attempting the swap for the first time. The inclusion of multiple tool shapes accounts for slight variations in fob seams across different Subaru models.

Just be aware that the video link lives on the packaging, so don’t throw the box away before you start working. For the price of a single dealer visit, getting two batteries and the exact tools needed feels like a practical trade-off.

CR2032 batteries with pry tools and a video card for 2015-2025 Subaru smart fobs.

Similar to the previous kit, this pack bundles two CR2032 batteries with pry tools, but it uses a physical video instruction card. It’s built for 2015-2025 smart fobs and skips the dealer entirely.

The tools are shaped to slide into the fob’s seam safely, and the batteries are sourced from the original manufacturer. Having a physical card means you can prop it up on your workbench while you work.

My read is that this is ideal if you want a visual walkthrough without hunting for a QR code or URL on your phone mid-repair. The tools are a necessary addition here, as prying with a house key is how most people crack their fob housing.

You get a backup battery, and since no software pairing is required, you’re back on the road immediately after closing the shell.

OEM CR2032 batteries with tools and videos for 2017-2024 Subaru models.

ZIWLU narrows the focus here, targeting 2017-2024 models like the Crosstrek, Impreza, and WRX (specifically fobs marked FHYQ14AHX or 2AOKM-SB4). I appreciate this level of specificity, as it reduces the chance of ordering the wrong cell. The kit includes OEM batteries, pry tools, and installation videos.

The batteries carry a long expiration date, meaning the spare won’t degrade while sitting in your glovebox.

If you drive a newer Subaru, checking that exact part number on your fob against this listing is the safest route. The included tools and videos remove the anxiety of snapping a plastic clip. However, if your Subaru is older than 2017, you’ll need to look elsewhere.

It’s a highly targeted solution for recent models where owners want factory-matching components.

Industrial-strength CR2032 batteries with an 8-year shelf life for 2015-2025 Subaru fobs.

This two-pack leans heavily into longevity, advertising industrial-strength CR2032 cells with an eight-year shelf life for 2015-2025 smart fobs. While it doesn’t bundle pry tools, the detailed installation guide in the product description compensates by walking you through the process.

No programming is required, and the emphasis here is purely on battery chemistry and lifespan.

I would shortlist this if you already know how to open your fob and just want a battery that won’t quit early.

The lack of tools means you’re on your own for the physical swap, but the eight-year shelf life claim suggests the spare will still hold a full charge years down the line. It’s a straightforward play for owners who prioritize cell quality over bundled accessories.

CR1620 batteries with tools for 2010-2020 Subaru head-key fobs.

This bundle includes two CR1620 batteries and three pry tools for 2010-2020 Subaru head-key fobs, such as Crosstrek, Forester, and Legacy. The batteries match OEM specifications, and the tools help open the fob without damage. An installation video is included, and no reprogramming is needed.

It’s tailored for older models with a physical key blade.

Perfect for owners of older Subaru models with head-key fobs. The CR1620 batteries are less common, so this pack is a specialized solution. The tools and video make it beginner-friendly, though the focus on 2010-2020 models limits compatibility. A must-have for those with traditional key designs.

CR1620 batteries with fitment guide for traditional Subaru key fobs.

This two-pack of CR1620 batteries is designed for traditional Subaru key fobs with a physical key blade, such as older Outback, Forester, and WRX models. The fitment guide ensures compatibility, and the batteries are premium Deluxe CR1620 cells. No programming is required, and the swap is quick.

The description includes a DIY guide for easy installation.

Best for owners of traditional Subaru keys who need a no-frills replacement. The fitment guide is critical, as these batteries won’t work with smart fobs. The lack of included tools means you’ll need your own, but the straightforward process compensates. A reliable option for older models.

CR2032 batteries with pry tools and video for Subaru smart fobs.

This pack includes two CR2032 batteries, pry tools, and a step-by-step installation video for Subaru smart fobs. Compatible with models like Outback, Forester, and WRX, it ensures a scratch-free installation. The batteries are OEM-grade, and the tools are dual-purpose for opening the fob and removing the old battery.

No reprogramming is required.

Great for those who want a complete, tool-inclusive solution. The video link is on the packaging, so keep it handy. The dual-purpose tools are a highlight, reducing the risk of damage. However, the fitment guide must be checked to confirm compatibility. A solid all-in-one option for smart fob owners.

OEM CR2032 batteries with scratch-free tools for 2015-2025 Subaru fobs.

This pack offers two OEM CR2032 batteries, a scratch-free pry tool, and a step-by-step installation video. Compatible with 2015-2025 Subaru models like Ascent, Crosstrek, and Legacy, it ensures a safe and easy swap.

The batteries are sourced from the same manufacturer as Subaru’s OEM parts, and the tool prevents damage to the fob casing.

Ideal for owners who prioritize OEM quality and ease of use. The scratch-free tool is a standout feature, and the video guide simplifies the process. The compatibility list is extensive, covering most modern Subaru models. However, it’s not suitable for push-button start systems or older head-key designs.

A top choice for smart fob users.

How To Replace the Battery Without Damaging the Fob

A careful approach prevents scratches, broken clips, or misaligned parts. The right tools and technique make the difference between a smooth swap and a costly mistake. Follow these steps to avoid common pitfalls.

When To Replace the Battery Proactively

Waiting for a complete failure isn’t ideal. Replacing the battery at the first sign of weakness prevents inconvenience and extends the fob’s lifespan. Some habits also accelerate battery drain.

Most Subaru key fob batteries last 2-4 years, but extreme temperatures, frequent use, or cheap batteries can shorten this. If you notice intermittent responsiveness or reduced range, replace the battery soon. Proactive replacement every 2 years avoids sudden failures.

Additionally, keeping the fob away from other electronics (like phones or keys) reduces interference that can strain the battery. Storing the fob in a cool, dry place also preserves its lifespan.

Troubleshooting After Replacement

If the fob still doesn’t work after a battery swap, a few checks can identify the issue. Most problems are simple fixes, but some may require professional help.

Replacing a Subaru key fob battery is a five-minute task with the right cell and tools. Start by confirming your fob type and battery model. Today, grab a compatible pack from the list above and swap the battery before it leaves you stranded.