Ford 1996 Windstar Manual page 324

Battery Replacement
If your original equipment battery requires replacement while
under warranty, it may, in some cases, be replaced by a
Motorcraft low-maintenance battery. The low-maintenance
battery has removable vent caps for checking the electrolyte
level and for adding water, if needed.
Check your battery's electrolyte level, at least every 12 months
or 12,000 miles (20,000 km), in temperatures up to 90˚F (32˚C).
Keep the electrolyte in each cell up to the "level" indicator. Do
not overfill the battery cell.
If the electrolyte level in your battery gets low, you can add
plain tap water to the battery, as long as you do not use hard
water (water with a high mineral or alkali content). If possible,
however, try to only fill the battery cell with distilled water. If
the battery needs water often, have the charging system
checked.
Help Us Protect Our Environment
Ford Motor Company strongly recommends that used lead-acid
batteries be returned to an authorized recycling facility for
disposal.
Battery recycling symbol
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