21 Manual Number 9018047 • Revision L, January 6, 2022
Capacity Check
A. Ensure that the unit is charged per Section 5.2.2 Charging.
B. Apply a constant current load of 17A to discharge the battery pack. (Capacity check
should be conducted at 23°C ±3°C (64-82°F) for accurate results.)
C. Monitor the time (in minutes and seconds) from initially applying the constant current
load in Step B until the unit has discharged down to 20.0VDC on the output.
D. Calculate the capacity in amp-hours (Ah):
Capacity (Ah) = (amps) x (hours) = (17 amps) x (Discharge time)
Discharge time (in hours) = discharge minutes / 60
E. The battery must be capable of supporting the aircraft’s emergency electrical load for
the required amount of time. One typical measurement for minimum capacity is 80% of
original capacity (i.e. 17Ah x 80% = 13.6Ah). However, this can vary by application and
could require more or less capacity to meet regulatory minimums.
Return to Service
A. Recharge the unit per section 5.2.2.
B. Measure and verify that the voltage on the unit’s power terminals is greater than 27.6
VDC. A unit shall never be returned to service if the voltage is less than this value.
C. Re-install the unit in the aircraft, including securing it via proper hold-downs, mating the
electrical connections, and verifying proper vent attachment.
D. Record service action in aircraft log book.
Preparing Battery for Shipment
In accordance with IATA and per UN 3480, Pl 965, Sections 1A and 1B, when shipped by
air the True blue Power Advanced Lithium-ion Battery must be shipped with a state of
charge (SOC) not to exceed 30% of rated capacity.
A. To prepare the battery for shipment, refer to the Advanced Lithium-ion Battery Support
Guide (located at
www.truebluepowerusa.com
), which includes a Shipping Preparation
Guide.
5.3
COMPONENT MAINTENANCE
The cells, electronics, and other components that comprise the TB17 Advanced Lithium-ion
Battery are not user serviceable or replaceable items. Therefore, data is not available from the
manufacturer to conduct field maintenance.
Summary of Contents for TB17 Series
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