Panasonic CR2016 Toyota Corolla Key Fob Battery

If your Toyota Corolla's key fob has started demanding extra button presses or lost its range entirely, the fix is almost always a fresh battery — and this Panasonic CR2016 is the right one for the job. Specifically matched to the Standard Key Fob on 2014–2019 Corolla models, this replacement lets you skip the dealership service lane and handle it yourself in under two minutes. It's the kind of five-dollar fix that feels like it should be more complicated, but genuinely isn't.

The Panasonic CR2016 uses lithium manganese dioxide chemistry, which delivers a stable 3 volts and holds that voltage steadily across its lifespan — unlike cheaper alkaline alternatives that sag as they discharge. At 20mm diameter and 1.6mm thin, it slots directly into the Standard Key Fob's battery tray without any modification. Panasonic's reputation for consistent coin cell quality means you're not gambling on a no-name cell that might test fine out of the box but fade within months.