Hearing Aid Batteries Explained: Sizes, Lifespan and Why More People Are Switching to Rechargeable
Hearing Aid Batteries Explained: Sizes, Lifespan and Why More People Are Switching to Rechargeable
Everything you need to know about disposable hearing aid batteries, plus a clear-eyed look at why rechargeable personal sound amplifiers are becoming the easier everyday choice.
Hearing aid batteries come in four standard sizes, each colour-coded so they're easy to identify, and most last anywhere from a few days to around two weeks depending on the size and how much the device is used each day. If you're currently searching for replacement batteries, wondering why yours keep running out, or simply weighing up whether to stick with disposables or move to a rechargeable device, this guide covers the practical detail most articles skip.
We'll also be honest about something: JD Health Tech's entire personal sound amplifier range is rechargeable, so we have a natural interest in that side of the conversation. We've tried to keep the battery information below accurate and useful on its own terms, whether or not you ever switch.
A quick note on terms: hearing aids are regulated medical devices, typically fitted by an audiologist and often, though not always, powered by disposable batteries. JD Health Tech sells personal sound amplifiers, a non-medical, rechargeable alternative designed for everyday listening clarity. The battery information in this guide applies broadly to disposable-battery hearing devices, whichever brand you use.
Standard hearing aid batteries are zinc-air cells sized 10 (yellow), 13 (orange), 312 (brown) and 675 (blue). Smaller batteries (size 10) tend to last a few days; larger ones (size 675) can last one to two weeks. Streaming audio, high-power devices, and humid storage all shorten battery life.
Hearing Aid Battery Sizes and Colour Codes
Hearing aid batteries come in four standard sizes, each marked with a coloured tab: 10 (yellow), 13 (orange), 312 (brown) and 675 (blue). These sizes are used across most major hearing aid brands in the UK, which is why pharmacies and supermarkets stock them by colour rather than by brand name.
| Size | Colour code | Typically used in | Approximate lifespan* |
|---|---|---|---|
| Size 10 | Yellow | Smaller CIC and ITE hearing aids | Roughly 3-7 days |
| Size 13 | Orange | BTE and larger ITE hearing aids | Roughly 6-10 days |
| Size 312 | Brown | RIC and slimline BTE hearing aids | Roughly 3-7 days |
| Size 675 | Blue | Power BTE hearing aids (higher output) | Roughly 9-14 days |
*General industry ranges only. Actual lifespan depends on your specific device, daily wear time, streaming use and storage conditions. Always check the manufacturer's guidance for your model.
Why are they called "zinc-air" batteries?
Hearing aid batteries are activated by air, not by a switch. A small sticker (the tab) seals an air hole on the back of the battery. Once you peel the tab off, oxygen reacts with the zinc inside to generate power. This is also why an unused battery keeps working for weeks after the tab is removed, even sitting in a drawer.
How Long Do Hearing Aid Batteries Actually Last?
Battery life depends on more than just size. The biggest factors are how many hours a day the device is worn, how much processing power the hearing aid uses, and whether Bluetooth streaming is switched on.
- Daily wear time. A device worn 14-16 hours a day will use a battery faster than one worn for a few hours.
- Streaming and Bluetooth. Streaming phone calls or audio draws noticeably more power than standard listening.
- Device power and features. Higher-output devices and those with extra noise processing tend to use more energy.
- Storage conditions. Heat and humidity can shorten shelf life before a battery is even used, so a dry, room-temperature drawer is best.
Tips to make batteries last longer
- Leave the tab on until you're ready to use the battery. Once removed, the clock starts even if the device is off.
- Open the battery door overnight so the device switches off fully, rather than leaving a battery under load.
- Let a fresh battery sit for a minute or two after removing the tab before inserting it, so it can fully activate.
- Store spares somewhere dry and at room temperature, not the bathroom cabinet or a car glovebox.
How to Change a Hearing Aid Battery Safely
Changing a hearing aid battery is straightforward once you've done it a few times, though small batteries can be fiddly for anyone with reduced dexterity or eyesight, and that's a fair and common frustration, and one of the main reasons people eventually look at rechargeable alternatives.
- 1Open the battery door gently. Most hearing aids have a small hinged door on the underside or back of the device.
- 2Remove the old battery and dispose of it safely (see recycling guidance below).
- 3Peel the tab off the new battery and wait a moment before inserting it, flat side matching the marking inside the compartment.
- 4Close the door gently, and it should click shut without force. If it resists, double-check the battery is seated the right way round.
Hearing aid batteries are small and can be a serious choking or poisoning hazard if swallowed, particularly by young children or pets. Keep spare batteries in a sealed container out of reach. If a battery is swallowed, the NHS advises treating it as a medical emergency: contact 111 or attend A&E immediately rather than waiting to see if symptoms develop.
Battery or Rechargeable: Is It Time to Switch?
Disposable batteries aren't a bad choice. For some people they genuinely work better. It's worth being honest about both sides before deciding.
Where disposable batteries still make sense
- You travel somewhere without reliable access to charging for extended periods.
- You like keeping a spare battery in your pocket as a reliable backup, with no dependence on remembering to charge overnight.
- You're used to the routine and it isn't currently causing you any problems.
Where rechargeable tends to suit people better
- You'd rather not handle small batteries daily, especially if dexterity or eyesight make that fiddly.
- You want to avoid running out unexpectedly during a meeting, meal out or social event.
- You'd prefer one predictable overnight routine (plug in, charge, go) rather than buying and storing loose batteries.
- You want to cut down on the ongoing cost and waste of buying batteries repeatedly.
This is exactly why JD Health Tech's entire personal sound amplifier range, including our rechargeable hearing amplifiers, moved to rechargeable-only. For a closer side-by-side look, our rechargeable vs battery comparison guide covers charging times, typical daily runtime and real running costs in more depth.
Can I recycle hearing aid batteries?
Yes. Zinc-air hearing aid batteries should never go in general household waste. Most UK pharmacies, opticians and supermarkets with battery recycling points will accept them free of charge, and many hearing aid retailers offer a collection point too.
Frequently Asked Questions
Most hearing aids use one of four standard sizes: 10 (yellow), 13 (orange), 312 (brown) or 675 (blue). The right size depends on your specific device, so check the battery compartment or your device manual, as using the wrong size won't fit or seat correctly.
Typically between three days and two weeks, depending on the battery size, how many hours a day the device is worn, and whether Bluetooth streaming is used. Smaller batteries generally need replacing more often than larger ones.
Generally yes, as long as the size matches (10, 13, 312 or 675), and these are standardised across manufacturers. Battery quality can vary between brands, so if you notice batteries running out unusually fast, trying a different brand of the same size is a reasonable first step.
Fast battery drain is usually down to heavy streaming use, a higher-power device setting, humid storage, or a battery that sat too long after the tab was removed. If a specific device is draining batteries unusually fast compared with before, it's also worth having it checked in case there's a fault.
Treat it as a medical emergency. Hearing aid batteries can cause serious harm if swallowed, particularly by children. Contact 111 or go to A&E straightaway rather than waiting for symptoms, and don't try to induce vomiting or give food or drink first.
Yes. They shouldn't go in household waste. Most pharmacies, opticians and supermarkets with battery recycling bins will take them free of charge.
No. JD Health Tech's personal sound amplifiers are rechargeable rather than battery-powered, so there's no need to buy, store or dispose of disposable batteries at all. You simply charge the device overnight, similar to charging a phone.
It depends on usage, but ongoing battery costs do add up over a year or more of regular replacements. Rechargeable amplifiers avoid that recurring cost, though the upfront price is worth comparing against your typical annual battery spend. Our rechargeable vs battery guide breaks this down in more detail.
Curious About Rechargeable Personal Sound Amplifiers?
See the JD Health Tech range, or take our free online hearing check (around 3-4 minutes) to get a personalised starting point.
Whether you stick with disposable batteries or move to a rechargeable personal sound amplifier, the most important thing is choosing a routine you'll actually keep up with. If you're weighing up your options, our UK-based support team at account.jdhealthtech.co.uk can help you compare models suited to your daily routine, and our returns policy gives you time to check a personal sound amplifier suits you before committing.
