The transmitter or smart key uses a 3 volt lithium battery which will normally last for several years.

When replacement is necessary, use the following procedure.

Remove the mechanical key.
Insert a slim tool into the slot and gently pry open the transmitter or smart key cover.
Replace the battery with a new battery (CR2032). When replacing the battery, make sure the battery position.
Install the battery in the reverse order of removal.

For transmitter or smart key replacement, Kia recommends to visit an authorised Kia dealer/service partner.

Caution

The keyless entry system transmitter is designed to give you years of trouble-free use, however it can malfunction if exposed to moisture or static electricity. If you are unsure how to use or replace the battery, Kia recommends to contact an authorised Kia dealer/service partner.
Using the wrong battery can cause the transmitter or smart key to malfunction. Be sure to use the correct battery.
To avoid damaging the transmitter or smart key, don't drop it, get it wet, or expose it to heat or sunlight.

Caution

An inappropriately disposed battery can be harmful to the environment and human health.

Dispose the battery according to your local law(s) or regulation.