Technical data

13773-001
24-30
Page 16 30 Nov 2000
returned to the same cell from which it was taken. The electrolyte should have a specific
gravity of 1.225 or above to avoid freezing.
CAUTION: To prevent contamination from one cell to the other, immediately reinstall
cell caps into their original location after testing the specific gravity.
Note: If the level is too low for accurate hydrometer readings, add just enough dis-
tilled water to cover the plates and charge the battery to mix the electrolyte.
(e) Record specific gravity of electrolyte drawn, then return electrolyte to the cell from which it
was taken.
Note: A specific gravity reading from 1.285 to 1.295 usually indicates a fully
charged cell. If the reading is from 1.220 to 1.260, the charge is considered
low. It is necessary to take temperature into consideration because specific
gravity readings shown on the hydrometer will vary from true specific gravity
as the temperature goes above or below 80° F (26.70° C). The standard
temperature used in rating lead acid battery performance is 77° F (25°C).
(5) Inspection/Check - Battery 1 Capacity
Note: A fully charged battery is considered serviceable if it meets 80% of the 30 minute
emergency capacity rating.
(a) Acquire necessary tools, equipment, and supplies.
(b) Perform load test as instructed by the manufacture of the load tester.
Note: Replace the battery if it fails to meet manufactures requirement.
(6) Battery Charging (Battery 1)
When the airplane isn’t being used, the battery may become discharged to a point in which the
battery will need to be recharged. When charging the battery, use a constant-voltage charger.
WARNING:
Charging batteries in an airplane or within 10 feet of a fuel servicing area is
prohibited by the National Electric Code. To prevent contamination from one
cell to the other, always reinstall cell caps into their original location.
When working with acid such as filling batteries, wear splash proof goggles
and protective clothing. Use extreme care to avoid spilling or splashing
electrolyte (which is diluted sulfuric acid) as it can destroy clothing and
burn the skin. When handling a plastic cased battery, excessive pressure
placed on the end walls could cause electrolyte to spew through the vents.
Therefore, always use the battery lifting strap or lift it with hands placed at
opposite corners. If electrolyte is spilled or splashed on clothing or the
body, it should be neutralized immediately with a solution of baking soda
and water and then rinsed with clean water.
Description P/N or Spec. Supplier Purpose
Battery/alternator Load
Te ste r
EECS300A Snap-on Test battery condi-
tion