Insert a slim tool into the slot and gently pry open the smart key cover.
Replace the battery with a new battery (CR2450). When replacing the battery, make sure the battery position. If the battery is assembled with incorrect polarity, it will discharge, rendering the key unusable.
Install the battery in the reverse order of removal.

Using the wrong battery can cause the smart key to malfunction. Be sure to use the correct battery.

WARNING

Never leave the keys in your vehicle with unsupervised children. Leaving children unattended in a vehicle with the Smart key is dangerous even if the EV button is not in the POWER ON or DRIVE READY position. Children copy adults and they could press the EV button. The key would enable children to operate power windows or other controls, or even make the vehicle move, which could result in serious bodily injury or death.
THIS PRODUCT CONTAINS A BUTTON BATTERY

If swallowed, a lithium button battery can cause severe or fatal injuries within 2 hours.

Keep batteries out of reach of children.

If you think batteries may have been swallowed or placed inside any part of the body, seek immediate medical attention.

CAUTION

The smart key 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 that you contact an authorized Kia dealer/service partner.
Using the wrong battery can cause the smart key to malfunction. Be sure to use the correct battery.
To avoid damaging the smart key, don't drop it, get it wet, or expose it to heat or sunlight.
An inappropriately disposed battery can be harmful to the environment and human health. Dispose the battery according to your local law(s) or regulation.

NOTICE

If, for some reason, you happen to lose your smart key, you will not be able to start the vehicle. Tow the vehicle, if necessary, contact a professional workshop. Kia recommends that you contact an authorized Kia dealer/service partner.
A maximum of 2 smart keys can be registered to a single vehicle. If you lose a smart key, Kia recommends that you contact an authorized Kia dealer/service partner.
When the smart key does not work properly, open and close the door with the mechanical key. If you have a problem with the smart key, Kia recommends that you contact an authorized Kia dealer/service partner.
If the smart key is not moved for some time, the detection function for smart key operation will pause. Lift the smart key to activate the detection again. (if equipped)