Aviation accessories
ASA CX-3 Flight Computer battery
4 × 1.5V alkaline cell
How to replace it
| How to open | Remove the entire back cover (ridge at bottom center; lift up). Remove old cells. Insert 4 new AAA batteries with polarity as marked. Press cover until it clicks flush (orientation-specific). |
|---|---|
| Orientation | Observe polarity diagram in compartment |
| Low battery indicator | Battery icon levels 100/75/50/25%; turns red at ≤25% |
| Notes | Removing batteries clears memory (required before some FAA knowledge exams). Auto screen-off after ~10 minutes inactivity. |
| Access | Tool-free |
Important
- Uses 4× AAA — not the same qty as Sporty's Electronic E6B (3× AAA).
- Alkaline expected per ASA manual runtime notes.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Panasonic eneloop AAA (LSD NiMH)
Replacement AAA cells when the device accepts NiMH
- Panasonic eneloop BQ-CC55 charger
Everyday NiMH AA/AAA charging (eneloop ecosystem)
- Battery tester
Quick good / low / dead check for household cells
New battery but still not working?
A fresh 4 × AAA should restore ASA CX-3 Flight Computer if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Observe polarity diagram in compartment
- Check the battery type
This device needs 4 × AAA (alkaline). Rechargeable cells are only suitable when the manufacturer accepts that chemistry — set battery type in device settings if available. Same size does not always mean the same battery.
- Check known model-specific issues
Uses 4× AAA — not the same qty as Sporty's Electronic E6B (3× AAA). Alkaline expected per ASA manual runtime notes.
- Confirm the battery itself
If you have a battery tester or multimeter, check the cell. A low open-circuit voltage often means replace; for rechargeable AA/AAA, a capacity test is more informative than voltage alone.
- Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.