PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
2E16
24-30-00
PAGE 24
Nov 30/06
(5) The battery may be charged at any rate, in amperes, not to exceed that point which would
produce bubbling and gassing of the electrolyte or a cell temperature of 115° F in any case.
NO
TE: If a cell temperature reaches the 115° F. limit, the charging rate shall be reduced and
the charge completed at 3 amperes or less. DO NOT CHARGE AT A HIGHER RATE
WHEN CELLS ARE GASSING. Refer to Gill Service Manual G.S.M.-682 for alternate
charging methods and service procedures.
(6) If a constant current (recommended) charge is available, the charge should be started at three
(3) amperes and reduced in half if and when cells start gassing until fully charged.
(7) As charging occurs, if any cells sputter or flood, the electrolyte level is too high and the excess
must be removed. In any case the electrolyte level shall be adjusted at the end of the charge.
The level will rise due to acid returning to the electrolyte mix, normal gassing, and expansion
due to temperature rise.
(8) Thoroughly clean battery after charging to prevent remaining acid bridges which can form
during charging.
NOTE: Never allow lead acid batteries or tools used on them to be near Ni-Cad batteries and
Ni-Cad battery tools.
F. Hydrometer Reading and Battery Charge
Whenever checking the battery, ascertain that all connections are clean and tight and that the fluid
level is above the baffle plates. If it is necessary to add fluid, fill cell with distilled water to the bottom
of the split ring. After adding water, charge the battery (per Charging, above) until gassing begins
before taking a hydrometer reading (i.e. - measuring specific gravity). Otherwise, the water and
electrolyte will not be mixed, giving a false reading.
Specific gravity values for a battery at various levels of charge at a temperature of 80° F are shown
in Chart 6.
Hydrometer readings given herein are at a temperature of 80° F. Different temperatures will effect
the hydrometer readings. Refer to Chart 7 for temperature corrections.
(1) To adjust low specific gravity, charge the battery (see Charging Battery) until it is gassing and
until the specific gravity rises no higher over a 3-hour period. Then remove some electrolyte
and replace with 1.300 specific gravity electrolyte. Repeat this step if, after one hour of
charging, the specific gravity is still too low. DO NOT ADJUST A CELL THAT DOES NOT GAS.
(2) To adjust high specific gravity, charge the battery (see Charging Battery) until it is gassing and
until the specific gravity rises no higher over a 3-hour period. Remove some electrolyte and
replace with distilled water. Repeat this step if, after one hour of charging, the specific gravity is
still too high.
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