It’s frustrating when your 2021 Subaru key fob battery dies unexpectedly. Several factors can contribute to a shortened battery life, with two primary culprits standing out.
Firstly, the quality control of CR2032 coin batteries, the standard for key fobs, varies. Not all batteries are created equal, and occasionally, a defective battery slips through (as noted in Ascent Forums). If you own a battery tester, it’s wise to quickly check a new battery before installing it in your fob. Even with a drained battery, you should still be able to enter your Subaru. However, it’s crucial to verify your emergency key now to ensure it mechanically unlocks your door correctly (refer to Ascent Forums). Starting your vehicle with a “dead” fob is possible (see online videos), but it can be unsettling if you’re unprepared. For reliable replacements, Energizer or Duracell are readily available and offer consistent quality. Genuine Panasonic batteries can be sourced online if preferred.
Secondly, your usage habits play a significant role. Do you frequently press the lock/unlock buttons as you approach or leave your Subaru? Repeatedly pressing buttons accelerates battery discharge. A helpful solution is to utilize your Subaru’s touch-enabled locking and proximity unlocking features. If you find yourself compulsively checking if your car is locked after walking away, consider using the MySubaru/Starlink app to confirm instead of pressing the fob buttons unnecessarily.
Furthermore, anecdotal evidence across various car brands suggests that storing your smart fob too close to your vehicle can drain both the car’s battery and the fob’s battery more quickly. To prevent this, keep your key fob at a distance from your Subaru, allowing the vehicle to fully “sleep.” Alternatively, you can purchase a Faraday cage or valet box to store your fob at home, blocking signals and preventing unnecessary battery drain.
Hopefully, these insights help you understand and address battery issues with your 2021 Subaru key fob.
