Lexus 2013 IS250C Owner's Manual page 427

Battery
Check the battery as follows.
■ Battery exterior
Make sure that the battery terminals are not corroded and that there
are no loose connections, cracks, or loose clamps.
■
Checking battery fluid
4-3. Do-it-yourself maintenance
Terminals
Hold-down clamp
Check that the level is between
"UPPER LEVEL" and "LOWER
LEVEL".
"UPPER LEVEL"
"LOWER LEVEL"
If the fluid level is at or below
"LOWER LEVEL", add distilled
water.
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