To replace the battery: Find the notch on the fob. Some fobs may require you to remove the interior key first. Gently pop the two halves apart.

Like anything else relying on a battery, you car key fob can die—often at the worst time. Thankfully, these batteries are easy to replace.

Replace the Key Fob Battery ASAP. Key fob batteries typically use flat, round lithium cells, most commonly CR2032 or CR2025, which are inexpensive and widely available at convenience stores, ...