Rexton BiCore R312

Rexton BiCore R312 batteries | Zinc-air size 312 guide & compatibility

If you’re using a Rexton BiCore R312 hearing aid, you need the correct size 312 zinc-air hearing aid batteries for reliable power and consistent sound. This page is your quick compatibility guide for Rexton BiCore R312 batteries, including how to confirm you’re choosing the right type, what to expect from battery life, and how to avoid the most common issues (short runtime, weak sound, or batteries that seem “dead”).

Which battery does Rexton BiCore R312 use?
The Rexton BiCore R312 uses size 312 (brown) zinc-air batteries. “312” is the standardized battery size for many hearing aids, and it refers to the battery’s physical dimensions and voltage type used for hearing aids.
Good to know: “R312” in the model name is a strong indicator that the instrument is designed for 312 batteries (as opposed to rechargeable models).

How to confirm you’re buying the right batteries
To be 100% sure you’re purchasing the correct battery for your Rexton BiCore R312, use these checks:

Look at your current battery pack: it should say 312 and usually uses a brown color code.
Check the back of the old battery: “312” is commonly printed on the face.
Check the battery door/compartment: many devices have the size marked inside the door.
Avoid guessing by shape only: sizes 10, 312, 13, and 675 are similar but not interchangeable.

312 vs other hearing aid battery sizes (why it matters)
Hearing aid battery sizes are not interchangeable. If you choose the wrong one, the battery may not fit, the door may not close, or your hearing aid may not power on correctly.

Size 10 (yellow): smaller than 312
Size 312 (brown): the correct choice for Rexton BiCore R312
Size 13 (orange): larger than 312
Size 675 (blue): much larger (often for power BTE models)

Expected battery life for Rexton BiCore R312
Battery life varies based on your hearing aid settings and daily use, but size 312 batteries commonly last several days in many users’ routines.
Battery life can be affected by:

Streaming: frequent audio streaming or phone calls can reduce runtime
Listening environment: challenging/noisy environments often require more processing power
Usage time: longer daily wear naturally uses more energy
Moisture and storage: humidity and improper storage can shorten battery performance

How to get the best performance from size 312 batteries
Follow these simple steps to help your Rexton BiCore R312 run longer and more reliably:

Let the battery “breathe”: after removing the sticky tab, wait about 1–2 minutes before inserting it. This allows zinc-air chemistry to activate properly.
Store at room temperature: avoid refrigerators and hot windowsills.
Keep hands dry: moisture can reduce performance and cause corrosion.
Open the battery door at night: when not in use, this can reduce drain and helps with moisture ventilation.

Common issues (and quick fixes)
The new battery doesn’t work

Make sure the tab is fully removed and the battery sat for 1–2 minutes before insertion.
Confirm you’re using size 312 (brown).
Check if the battery is inserted with the correct polarity (usually the flat “+” side faces up).

Battery life seems too short

Streaming and high volume can significantly increase power use.
Check for moisture in the battery compartment; gently wipe and let it air out.
If batteries drain very quickly, your hearing aid may need a check for debris or a service inspection.

Buying Rexton BiCore R312 batteries
Choose size 312 zinc-air hearing aid batteries for your Rexton BiCore R312. If you use batteries regularly, it often makes sense to buy multi-packs so you always have spares on hand—especially for travel.
If you’re unsure whether your BiCore is a battery model or a rechargeable variant, check your exact model name or battery door design before ordering.

FAQ: Rexton BiCore R312 batteries
Are Rexton BiCore R312 batteries rechargeable?
No. The “R312” version is designed for disposable size 312 zinc-air batteries. Rechargeable versions are typically listed as “R” (rechargeable) without the 312 designation, depending on the exact model naming.

What color is a 312 hearing aid battery?
Brown is the standard color code for size 312.

Can I use size 13 instead of 312?
No. Size 13 is physically larger and will not fit correctly in a hearing aid designed for 312.

Do I need “mercury-free” batteries?
Modern hearing aid batteries are typically mercury-free due to regulations in many regions. Any quality zinc-air size 312 battery intended for hearing aids is suitable.

Should I remove the battery tab and insert immediately?
It’s better to wait about 1–2 minutes after removing the tab. This helps the battery activate and can improve consistency.