Oticon Hearing Aid 3 Tones — Low Battery Fix

What Does This Error Mean?

Three ascending tones from an Oticon hearing aid is the standard low battery signal. The tones indicate the battery has approximately 1–2 hours of usable life remaining. Rechargeable models should be placed in the Oticon SmartCharger; battery-powered models need a new zinc-air cell.

Affected Models

Oticon Real
Oticon More
Oticon Intent
Oticon Own
Oticon Zircon
Oticon Ruby

Common Causes

Zinc-air battery on a battery-powered model has reached the low threshold
Rechargeable battery in an Oticon Real or More aid has depleted below the warning level
Extended use or heavy streaming has accelerated the battery drain cycle

How to Fix It

For rechargeable models — place aids in the SmartCharger

Open the lid of the Oticon SmartCharger and seat both aids in the labelled left and right slots. The LED indicators on the SmartCharger confirm charging is active. A full charge takes approximately 3 hours and provides up to 24 hours of use.
For battery-powered models — replace the zinc-air cell

Open the battery door on the hearing aid, remove the old battery, and insert a fresh zinc-air cell of the correct size. Most Oticon aids behind the ear use a size 312 (brown tab) battery. Wait 60 seconds after removing the tab before inserting the battery to allow full oxygen activation.
Confirm the correct battery size

The inside of the battery door typically has a colour-coded sticker indicating the correct size: brown = 312, orange = 13, yellow = 10, blue = 675. Using the wrong size risks damaging the battery door contacts.
Check battery life expectations

A size-312 zinc-air battery in an Oticon aid typically lasts 5–7 days with standard use. Streaming via Bluetooth (TV Adapter, phone calls) can reduce this to 3–5 days. If your battery is lasting less than 3 days, discuss this with your audiologist — the aid may need servicing.

Frequently Asked Questions

Why do the 3 tones sound like they are going up in pitch?

Oticon uses ascending tones (low–mid–high) for the low battery warning specifically to distinguish it from other signals the aid produces, such as program change confirmations or volume adjustments. The rising pitch pattern is intentional and consistent across the entire Oticon range.

Can I check the Oticon battery level in the app before the tones play?

Yes. The Oticon Companion app shows the battery percentage for each aid on the main screen. Checking the app periodically lets you anticipate when to recharge or change batteries before the 3-tone warning occurs, which is especially useful before long trips.