Lexus 2004 GX470 Owner's Manual page 579

ELECTRICAL COMPONENTS
Checking battery exterior
564
"
1 Terminals 2 Hold-down clamp
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.