Lexus SC 430 2001 Owner's Manual page 232

4-3. Do-it-yourself maintenance
Before recharging
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Recharging, the battery produces hydrogen gas which is flammable and explosive.
Before recharging:
If recharging with the battery installed in the vehicle, be sure to disconnect the
●
ground cable.
Make sure the power switch on the recharger is off when connecting and dis-
●
connecting the charger cables to the battery.
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