Lexus LS460 Owners Book page 657

Before recharging
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When recharging, the battery produces hydrogen gas which is flammable and
explosive. Therefore, observe the following before recharging:
If recharging with the battery installed on the vehicle, be sure to disconnect the
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ground cable.
Make sure the power switch on the charger is off when connecting and discon-
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necting the charger cables to the battery.
CAUTION
Chemicals in the battery
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A battery contains poisonous and corrosive sulfuric acid and may produce hydro-
gen gas which is flammable and explosive. To reduce the risk of death or serious
injury, take the following precautions while working on or near the battery:
Do not cause sparks by touching the battery terminals with tools.
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Do not smoke or light a match near the battery.
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Avoid contact with eyes, skin and clothes.
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Never inhale or swallow electrolyte.
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Wear protective safety glasses when working near the battery.
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Keep children away from the battery.
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Where to safely charge the battery
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Always charge the battery in an open area. Do not charge the battery in a garage or
closed room where there is not sufficient ventilation.
How to recharge the battery
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Only perform a slow charge (5 A or less). The battery may explode if charged at a
quicker rate.
4-3. Do-it-yourself maintenance
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