Lexus LX 470 1998 Owner's Manual page 305

ELECTRICAL COMPONENTS
Checking battery fluid
There are 2 types of batteries: maintenance type and
non−maintenance type.
A non−maintenance battery has "MAINTENANCE FREE
BATTERY" on its top. A maintenance type battery does not have
such indication.
Maintenance type battery
Check the fluid condition by the fluid level lines on the side of the
battery. Or if the battery has a hydrometer on its top, you can also
check the hydrometer.
Non−maintenance battery
Check the battery condition by the hydrometer on the top of the
battery.
288
(a) Checking by the fluid level lines (Maintenance type battery
only)
64X005b
" 1 Upper line
2 Lower line
The fluid (electrolyte) level must be between the upper and lower
lines.
When checking the fluid level, look at all six cells, not just one or
two.
If the level is lower than the lower line, add distilled water. (See
"Adding distilled water" on page 290.)