Toyota Lexusc Owner's Handbook Manual page 712

Checking battery exterior
"
1 Terminals 2 Hold-down clamp
ELECTRICAL COMPONENTS
Check the battery for corroded or loose connections,
cracks, or loose hold-down clamps.
1. If the battery is corroded, wash it off with a solution of warm
water and baking soda. Coat the terminals with grease to
prevent further corrosion.
2. If the connections are loose, tighten the clamp bolts — but
do not overtighten.
3. Tighten the hold-down clamp only enough to keep the
battery firmly in place. Overtightening may damage the battery
case.
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