1999 Lexus SC 400 Owners Manual - Page 404

ELECTRICAL COMPONENTS Adding distilled water (Maintenance type battery only) 1. Remove the vent plugs. 2. Add distilled water to cells needing fluid. If the side of your battery is covered, check the water level by looking down directly above the cell as illustrated above. 3. Retighten the vent plugs securely. BATTERY RECHARGING PRECAUTIONS During recharging, the battery is producing hydrogen gas. Therefore, before recharging: 1. Maintenance type batteries - Remove the vent plugs. 2. If recharging with the battery installed on the vehicle, be sure to disconnect the ground cable. 3. Make sure the power switch on the recharger is off when connecting the charger cables to the battery and when disconnecting them. NOTICE D Do not overfill the cells. Excess electrolyte could squirt out of the battery during heavy charging, causing corrosion or damage. D Use a cover on the battery for longer life. 386