HumanTechnik InfraLight DIR Mode D'emploi page 15

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If the sound quality of the receiver becomes noisy and distorted you should
replace the battery pack with a charged one or charge the receiver, including
battery, in its cradle.
Warning: do not force the battery pack into the charger or receiver.
It fits easily when in the correct orientation.
How to get the most out of your rechargeable batteries
Please make sure that both batteries are used on a regular basis.
Constantly recharging the batteries will shorten their service life.
That's why you should exchange the batteries in the hearing aid
with the batteries in the charging station regularly (for best results,
once a week).
Maintenance of the headset receiver
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The ear pieces have to be cleaned or exchanged if dirty.
To replace, please use the silicone earpieces for DIR headsets. They
are available separately as special accessories (order no. A-4985-0).
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