Lexus 2003 LS Owner's Manual page 404

ELECTRICAL COMPONENTS
Checking battery exterior
64L085a

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.
390
NOTICE
A Make sure the engine and all accessories are turned
off before performing maintenance.
A When checking the battery, remove the ground cable
first and reinstall it last.
A Be careful not to cause a short circuit with tools.
A Take care no solution gets into the battery when
washing it.