Various embodiments of the invention provide an enclosure for a metal-air battery assembly (40) for an extended wear hearing aid. The enclosure includes a diffusion control element (80) having a dimensional property configured for controlling oxygen and moisture diffusion into the metal-air battery assembly (40) to maintain a minimum battery voltage when the hearing aid is operating and worn in an ear canal (10) of a user over an extended period. In an embodiment, the enclosure (70) can comprise a shell (75) with a base end having an opening (76) therein forming a cavity (77) within the shell (75) and a base cap (78) for covering the opening of the base end. A diffusion element (80) is disposed on the base cap. In an embodiment, the diffusion element (80) comprises a laser drilled precision micro hole having an aspect iatio of least about four and a diameter in the range of about 10 to 15 microns.

Title
Precision micro-hole for extended life batteries
Application Number
PCT/US2005/002597
Publication Number
2005/072383
Application Date
January 27, 2005
Publication Date
August 11, 2005
Inventor
O Hara Tom
Baker Ross
Gable Richard
Agent
HARRIS Joel M
Assignee
O Hara Tom
Baker Ross
Gable Richard
Insound Medical
IPC
H01M 04/00
F16K 47/08
H04R 25/00
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