Aviation accessories
ASA Flight Timer (TIMER-3) battery
2 × 1.5V alkaline cell
How to replace it
| How to open | Turn mounting clip horizontal. Press snap tab down and remove battery cover. Install 2 AAA alkaline batteries per polarity diagram. Confirm display is on. Reinstall cover (bottom lugs first, then snap). |
|---|---|
| Orientation | Observe polarity diagram |
| Low battery indicator | Low battery indicator on display |
| Notes | Instruction/pilot information aid — not an avionics instrument (per ASA manual). |
| Access | Tool-free |
Important
- 2× AAA alkaline — different qty from electronic E6B siblings.
- Avoid prolonged direct sunlight / heat (display may temporarily black out).
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 2 × AAA should restore ASA Flight Timer (TIMER-3) 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
- Check the battery type
This device needs 2 × 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
2× AAA alkaline — different qty from electronic E6B siblings. Avoid prolonged direct sunlight / heat (display may temporarily black out).
- 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.