Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 437 / 1956

PAGE 21
Feb 28/07 2I15
24-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
10. Battery Capacity Test
A. Remove battery from aircraft.
B. Charge it in compliance with our charging instructions for sealed batteries.
C. Allow battery to stand on open circuit for one (1) hour.
D. Connect fully charged battery to capacity tester that incorporates a load resistance, amp meter,
voltmeter and a time clock (timer).
E. Discharge battery at the 1 hour capacity rate to 1.67 volts per cell (21.0 volts). Note the discharge
time to the end voltage.
The battery is considered airworthy if it meets 80% of the 1 hour capacity rating (minimum of 48 minutes
to the cut off voltage).
If the battery fails to meet the minimum run time, recharge using the constant potential method until
charge current stabilizes (this could take 10 to 24 hours). Allow the battery to stand on open circuit for
one (1) hour after recharging. Repeat the above capacity test. If the failure persists, replace the battery.
If battery is found to be airworthy as noted above, recharge the battery prior to re-installing it in the
aircraft.
TELEDYNE CONSTANT CURRENT CHARGING RATES/CAPACITY 1 HOUR
Battery CHARGE RATES 30 MIN EMERGENCY RATE
Type (AMPS) RATE (AMPS) (AMPS)
GILL-G250S 1.0 23 15.0
CHART 7
CONSTANT CURRENT CHARGE