Owners of other Hyundai or Kia vehicles such as the Elantra, Sonata, Azera, Santa Fe, Tucson, Accent, Ioniq, Genesis, Tiburon, ix20, i20, i30, i40, Veracruz, Optima, Cadenza, K900, Soul, Niro, Sportage, Sorento, Sedona, Rio, Forte and Spectra may also find these DIY instructions to be helpful.

A replacement coin cell (A.K.A. "button" or "watch") battery is part number CR2032 which is available from various manufacturers such as Panasonic, Sony, GE, Energizer, Duracell and Maxell.

The only tool needed to access and replace the key fob battery is a small plastic pry bar tool or a flathead screwdriver.

Insert the blade of the tool or screwdriver in to the slot on the top edge of the key fob near the "Lock" button.

Gently pry apart the two halves of the fob.

Remove the remote control unit (rubber button cover and green circuit board) out of the front half of the fob.

Insert a new number CR2032 battery into the socket with the "+" positive side facing up towards you and the "-" negative side facing down.

If you use the screwdriver to push the old battery out of the socket, try to avoid bending the electrical contacts or scratching the green plastic circuit board.

Line up the two halves of the fob and gently pop them back together.

Make sure that the front and back cover of the fob are flush together at every edge.

To test the new battery, stand near your car and press the "Unlock" or "Lock" buttons.

If the new battery is working properly, you should see the parking lights flash and also hear the door locks opening or closing.

For more, check out all of my 2012-2017 Hyundai Veloster DIY Repair & Maintenance Guides.