How to Replace the Key Fob Battery in a Volvo C30

1. Lay the remote key with the keypad facing down and pry the cover open with a small slotted screwdriver.
2. Remove the cover.
3. Note how the + and – sides of the battery sit on the inside of the cover.
4. Pry out the old battery and put in the new one, without touching the battery or its contact surfaces with your fingers.
5. Press the cover back into place.

• Battery type is CR 2450, 3V.
• Avoid touching the electrical circuitry in the other half of the remote key.
• A weak battery shows the Information symbol and KEY BATTERY LOW VOLTAGE in the display.

Source: 2013 Volvo C30 owner's manual, PDF page 130. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.