Lexus CT200h Owner's Manual page 532

4-3. Do-it-yourself maintenance

Use a CR1632 lithium battery

Batteries can be purchased at any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional, local electrical appli-
ance shops or camera stores.

Replace only with the same or equivalent type recommended by the
manufacturer.

Dispose of used batteries according to local laws.

When the card key battery needs to be replaced (if equipped)
The battery for the card key is available only at Lexus dealer. Your Lexus
dealer can replace the battery for you.

If the electronic key battery is depleted
The following symptoms may occur:

The smart entry & start system, push-button start system and wireless
remote control will not function properly.

The operational range will be reduced.
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