Toyota FORTUNER 2021 Owner's Manual page 399

Use a lithium battery
Vehicles without smart entry & start system: CR1620
Vehicles with smart entry & start system: CR2032
Batteries can be purchased at your Toyota dealer, local electrical appliance
shops or camera stores.
Replace only with the same or equivalent type recommended by the manu-
facturer.
Dispose of used batteries according to local laws.
If the key battery is depleted
The following symptoms may occur:
The smart entry & start system (if equipped) and wireless remote control will
not function properly.
The operational range will be reduced.
WARNING
Battery precautions
Observe the following precautions.
Failure to do so may result in death or serious injury.
Do not swallow the battery. Doing so may cause chemical burns.
A coin battery or button battery is used in the electronic key. If a battery is
swallowed, it may cause severe chemical burns in as little as 2 hours and
may result in death or serious injury.
Keep away new and removed batteries from children.
If the cover cannot be firmly closed, stop using the electronic key and stow
the key in the place where children cannot reach, and then contact your
Toyota dealer.
If you accidentally swallow a battery or put a battery into a part of your
body, get emergency medical attention immediately.
To prevent battery explosion or leakage of flammable liquid or gas
Replace the battery with a new battery of the same type. If a wrong type of
battery is used, it may explode.
Do not expose batteries to extremely low pressure due to high altitude or
extremely high temperatures.
Do not burn, break or cut a battery.
6-3. Do-it-yourself maintenance
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