This 3D printed Battery Holder Keyring is designed to securely hold 312 hearing aid batteries, suitable for brands like Phonak, Oticon, and Resound. The water-resistant case is lightweight and compact, making it easy to carry in your pocket or on your keychain for convenient access. Manufactured in the United Kingdom, this universal size holder offers a practical and stylish solution for keeping your hearing aid batteries organized and easily accessible.
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