Ford 1996 Contour Manual page 214

Servicing Your Contour
Battery
Your vehicle may have a Motorcraft maintenance-free battery.
The Motorcraft maintenance-free battery does not require
additional water during its life of service. The vents are part of
the cover and cannot be removed. For longer, trouble-free
operation, keep the top of the battery clean and dry. Also, make
certain the battery cables are tightly fastened to the battery
terminals.
If you see any corrosion on the battery cables or terminals,
remove the cables from the terminal and clean them both with a
wire brush. You can neutralize the acid with a solution of
baking soda and water. Reinstall the cables when you are done
cleaning them, and apply a small quantity of grease to the top
of each battery terminal to help prevent corrosion.
Battery Replacement
If your original equipment battery requires replacement (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 above 90˚F (32˚C)
and more often in temperatures above 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 don't use hard
water, or 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.
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