Why is the Phonak hearing aid LED light still blinking after charging for over 3 hours?

My Phonak hearing aid does not charge to 100%. Hearing aid is in the charger all night and the LED light on the hearing aid does not turn solid green.

The LED light blinking red, orange, or green while the hearing aids are in the charger indicates that the hearing aids are in the process of being charged.
Clean the contacts of the hearing aid and the charger. Remove the dust or dirt from the charging slots with a soft, lint-free cloth.
If the problem persists, contact your hearing care professional for assistance.

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Why is the Phonak hearing aid LED light still blinking after charging for over 3 hours?