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6.3.4 The battery should achieve full capacity in 2 cycles. If it does not, reject the
battery.
6.4
DEEP-DISCHARGE RECOVERY
6.4.1 Deep discharge is usually indicated by a battery voltage of less than 24 volts. A
battery which has been deeply discharged can be recharged using constant-
current charging techniques for best recovery.
6.4.2 Discharge the battery at the one hour rate (see Table 3) until the battery drops to
20V.
6.4.3 Recharge the battery at a constant current charge rate of 1.0A for a total input (in
ampere-hours) of 120% of the one-hour capacity, which is determined as follows:
For example, for a one-hour capacity of 27 Ah, the charge time is determined as
follows:
1.2 (120% input) x 27Ah = 32.4 Ah (Ampere-hours) needed.
At the charge rate of 1.0 amperes, the total charge time would be:
32.4Ah/1.0A = 32.4 hours.
6.4.4 After a pause of about 1 hour, discharge the battery at the one hour rate (see
Table 2) until the battery drops to 20V. Record the time to 20V. If it is greater
than 85% of specification (see Appendix A), recharge per Section 5.2 and return
to use. If not, continue to Section 6.4.5.
6.4.5 Charge the battery at constant potential of 28.6V± 0.4V until the charge rate
drops to 1A, followed by a constant current charge at 1A for 12 hours.
6.4.6 Discharge the battery at the one hour rate (see Table 2) until the battery drops to
20V. The battery should be at least 85% of capacity. If the battery is lower than
85%, repeat step 6.4.6 one more time. If the battery does not provide more than
85% of the rated specification, it should be rejected.
6.4.7 Avoid subjecting a battery to frequent deep discharges as this can reduce the
useful life of the battery.
6.5
MONITORING BATTERIES IN LONG-TERM STORAGE
After storage or before installation on aircraft, follow the guidelines below. Refer to
Section 4.3.
6.5.1 If the batteries are stored for two years at recommended temperatures, the
batteries can be recharged at constant current of 1A for 120% of the one hour
Q01-4000
COMPONENT MAINTENANCE MANUAL
Rev G
Page 14 of 28
Teledyne Battery Products
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