Size 13 Hearing Aid Battery

Recognised by its orange colour code, the size 13 battery is the size often used by medium and high-power behind-the-ear devices. It is about 7.9 mm in diameter and 5.4 mm thick; its diameter is the same as the size 312 battery, but because it is thicker it stores more energy. Like all hearing aid batteries, it is a 1.45 V zinc-air battery.

Device types that use it

Size 13 batteries are mostly used in standard behind-the-ear (BTE) hearing aids and in full-shell in-the-ear (ITE) models that fill the outer ear. Some high-power RIC devices also use this size. For example, the Phonak Vitus + BTE P runs on a size 13 battery. The four sizes on the market (10, 13, 312, 675) are not interchangeable; keep your device's size in mind.

Battery life

Average battery life is 6-14 days. How many hours a day you wear the device, its power level, battery quality and wireless streaming from a phone or TV can shorten or extend this. When the battery gets weak, your device warns you: on most models you hear 3 beeps every 10 minutes, and when the voltage drops to 0.95 V the device gives six double beeps and switches the sound off. So it is a good idea to carry a spare battery.

Fitting steps

• Remove the protective tab (sticker) from the battery and leave it in contact with air for 1-2 minutes.
• Open the battery door and place the battery with the + (plus) sign facing the right way; do not force the door.
• The device switches on when you close the door.

Care and safety notes

Switch the device off when you are not using it, and at night take the battery out and leave the door open so that moisture inside can escape. Store batteries out of reach of children, do not throw them into fire, and do not try to charge non-rechargeable batteries. Do not put used batteries in household waste; return them to the centre where you bought them.

You can buy size 13 batteries at our Pendik centre. If you use a thinner battery, see the size 312 battery page, and for other options see our hearing aid batteries page.