Aviation headsets
Lightspeed Sierra battery
2 × 1.5V alkaline cell
How to replace it
| How to open | Replace two AA batteries when power LED flashes red. Install new batteries promptly at any low-battery indication. |
|---|---|
| Low battery indicator | Power LED flashes red; continues as passive if batteries die |
| Notes | Alkaline preferred; lithium for cold; avoid rechargeable / mixed brands. |
| Access | Tool-free |
Important
- Accepted: alkaline AA preferred; lithium AA for cold. Rechargeable not recommended.
- Dual GA battery configuration — identify Sierra by model, not by aircraft panel connector.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Panasonic eneloop AA (LSD NiMH)
Replacement AA 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 × AA should restore Lightspeed Sierra if the battery was the problem. Work through the checks below before replacing the device.
- Check the battery type
This device needs 2 × AA (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
Accepted: alkaline AA preferred; lithium AA for cold. Rechargeable not recommended. Dual GA battery configuration — identify Sierra by model, not by aircraft panel connector.
- 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.