Battery Maintenance

The SAI-340A contains a field-replaceable Li-Poly battery pack. This battery requires periodic replacement to ensure sufficient capacity is available to meet performance specifications.

Battery Operation

The battery sub-system in the SAI-340A is designed to fulfill the needs of an independent power source per 14 CFR 23.1353(h). Considerations are as follows:

• Automatic transition to battery will occur if the externally supplied power drops below approximately 7 VDC.
• A load-test is performed on each power-on cycle - a faulted battery indication will be shown if this test fails.
• Battery operational time is highly dependent on the ambient operating temperature and backlight intensity settings. See the specifications section in this document for minimum guaranteed operating time under different conditions.
• Reference the SAI-340A Pilots Guide (document number 306503-00) for additional details on battery operation.

Operational Limitations

• Battery operation may be inhibited for up to 15 minutes during cold-starts. TSO performance is met within 10 minutes during cold-starts.
• No operational capability on internal battery is possible if the battery is faulted, as shown by a Red-X over the battery icon.
• Battery charging is disabled below approximately 0°C and above 40°C ambient, or when power input is below approximately 11 volts DC.

Battery Limitations

The battery must be replaced when any of the following occurs:

• The battery fails the power-on self-test as indicated by a Red-X over the on-screen battery icon.
• The battery fails to charge during normal operation.
• The battery fails the full-duration load test (described below).
• The battery pack is over 5 years old, as measured by the battery pack installation date.

Battery Type 0 (P/N 306186) .....................Li-Poly, 7.4V, 1300mAh, Heated
Battery Life (-20°C, 100% Brightness) .......0.5 Hours Minimum
Battery Life (+23°C, 100% Brightness) ......2.0 Hours Minimum
Battery Life (+55°C, 100% Brightness) ......3.0 Hours Minimum
Battery Charge Time ...............................4 Hour Typical (From Fully Discharged)
Battery Heat Time ..................................15 Minutes Max @ -20°C Cold Soaked

Full-Duration Load Test

This test performs a full-discharge cycle to ensure that proper capacity is available. A degraded or aged battery will be detected by this procedure. This procedure must be performed every 24 months.

1. This test is to be done at ambient temperature ranging from +50°F (+10°C) to +90°F (+26°C). The unit must be fully thermally stabilized in this range.
2. Ensure battery is fully charged by verifying that a charge of 100% is shown. If not, charge as follows:
   a. Place the aircraft on ground-power and turn the unit on.
   b. Allow the battery to fully charge to 100% and verify that the battery charging symbol is no longer presented. (Battery charging may continue for a short duration even though 100% is shown).
3. Set the display to full-intensity by pressing the rotary knob and rotating clockwise as needed. Press the knob again to dismiss the brightness menu.
4. Remove power to the unit by pulling the corresponding circuit breaker and cancel the power-down sequence by pressing the knob.
5. Note the current time and allow unit to operate for 2 hours. At the end of the 2 hour period, if the unit has shut-down, or on-screen parameters are Red-X’ed, the battery must be replaced.

! IMPORTANT !
Do not inadvertently connect the battery to the heater connector. Identical connectors are utilized for each.
Follow the indicated color coding.
DAMAGE TO THE UNIT MAY OCCUR

Do not drop, puncture or otherwise tamper with the battery pack.