Size 675 (blue) battery: equivalents & specs
Size 675, with a blue tab, is the largest standard hearing aid battery: a 1.45 volt zinc-air cell, 11.6 mm across and 5.4 mm tall, packing 600 to 650 mAh. It serves power behind-the-ear aids and cochlear implant processors, running nine to twenty days.
Same battery, other names
Every code below is the exact same cell as Size 675 (blue). Any of them will fit and work identically.
⚠️ Button batteries are dangerous if swallowed. The 675's size makes it especially hazardous; store it in original packaging away from children.
Buying and replacement notes
The 675 shares its case dimensions with the LR44/SR44 button family, but do not interchange them: zinc-air delivers far more energy at a lower 1.45 volts and needs air holes to breathe, while an LR44 in a hearing aid sags immediately under the load. Cochlear implant users often need the special high-power 675 variants (sometimes tabbed differently) their processor maker specifies.
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.