Aviation headsets
Motorola MHP71 battery
4 × 1.5V alkaline cell
Motorola’s MHP71/MHP81 user guide: two N alkaline cells per ear cup (four total). Same procedure as MHP81. Not A23/A27 12V remote cells.
How to replace it
| How to open | Turn each ear-cup volume knob off. Gently lift the foam flap inside each ear cup to expose the battery holder. Remove old N cells carefully (no sharp/conductive tools). Insert two fresh N alkaline cells per cup following the polarity markings, then reseat the foam flap. |
|---|---|
| Orientation | Follow polarity (+/−) markings on each ear-cup holder |
| Access | Tool-free |
| Notes | Motorola: new batteries typically last over 220 hours. Remove batteries before long-term storage to avoid corrosion. |
Important
- Quantity is four N cells total — two per ear cup. Do not confuse N (1.5V) with A23/A27 (12V).
- Sibling MHP81 shares the same Motorola battery procedure.
- Hearing-protection fit and NRR claims are outside this battery page — follow Motorola fitting instructions.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
- Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
- Digital multimeter
Measure open-circuit voltage and general electronics checks
New battery but still not working?
A fresh 4 × N should restore Motorola MHP71 Electronic Earmuffs if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Follow polarity (+/−) markings on each ear-cup holder
- Check the battery type
This device needs 4 × N (alkaline). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Quantity is four N cells total — two per ear cup. Do not confuse N (1.5V) with A23/A27 (12V). Sibling MHP81 shares the same Motorola battery procedure. Hearing-protection fit and NRR claims are outside this battery page — follow Motorola fitting instructions.
- Confirm the battery itself
Try a known-good fresh cell of the exact code listed above.
- 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.