Size 10 (yellow) battery: equivalents & specs
Size 10 is the smallest common hearing aid battery, marked with a yellow tab: a 1.45 volt zinc-air cell, 5.8 mm across and 3.6 mm tall, holding 90 to 100 mAh. It powers the tiniest in-canal hearing aids and typically lasts three to seven days.
Same battery, other names
Every code below is the exact same cell as Size 10 (yellow). Any of them will fit and work identically.
⚠️ Small button batteries are an ingestion hazard for children and pets. Store and discard them out of reach; a swallowed cell requires immediate emergency care.
Buying and replacement notes
Hearing aid batteries are color-coded industry-wide, and yellow always means size 10 regardless of brand. Zinc-air cells breathe: peeling the tab lets air in and starts the chemistry, so wait about a minute after peeling before closing the battery door, which measurably improves voltage and total life. Once activated, the cell runs down in a few weeks whether used or not, so never peel tabs in advance.
Commonly used in
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⚠️ 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.