Size 5 (red) battery: equivalents & specs
Size 5, tabbed in red, is the rarest of the zinc-air hearing aid batteries: 1.45 volts, 5.8 mm across and just 2.15 mm tall, with only 30 to 35 mAh. A short-lived generation of ultra-tiny in-canal aids used it, and few current models do.
Same battery, other names
Every code below is the exact same cell as Size 5 (red). Any of them will fit and work identically.
⚠️ Button batteries are dangerous if swallowed. Keep them away from children and pets.
Buying and replacement notes
This size delivers only one to three days per cell, which is why the market moved back to size 10 as micro aids got more efficient instead. If you own an aid that takes size 5, buy from suppliers with verified turnover, since slow-selling stock loses quality with age, and consider asking your audiologist whether newer size-10 models would serve you better at replacement time.
Commonly used in
Need a replacement?
Shop Size 5 (red) batteries on Amazon →⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.