Volvo C30 key fob battery
3 of the 7 model years listed for the Volvo C30 have a proven battery. The most common answer is CR2450. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2007Key-head remote
Not confirmed yet
- 2008-2009Key-head remote
CR2450
FCC ID KR55WK49250; KR55WK49259Owner's manual: manualowl.com (checked Nov 2, 2026)
Manual text: “the battery (type CR 2450, 3V) is weak”
Find CR2450 on Amazon - 2010-2011Key-head remote
Not confirmed yet
- 2012Key-head remote
CR2450
FCC ID KR55WK49250; KR55WK49259Owner's manual: manualowl.com (checked Nov 2, 2026)
Manual text: “the battery (type CR 2450, 3V) is weak”
Find CR2450 on Amazon - 2013Key-head remote
Not confirmed yet
Changing the battery
Key with remote in the head
- The remote electronics sit in the plastic head of the key itself, so there is no separate fob to open.
- Find the seam around the head. Twist a coin or small flat screwdriver in the notch at the blade end or side until the halves part.
- Inside you may find a small circuit board in a tray. Lift the board out if the cell is underneath, swap the cell with the same side up, and refit the board.
- Snap it closed and press each button. The car still starts with a dead remote battery on most of these keys, because the start chip needs no battery.
A CR2450 is 24.5 mm across and 5.0 mm thick, much fatter than a CR2032. A thinner cell will rattle and lose contact, so buy the exact size.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.