Care and maintenance
22 | HD 250BT
Information on the built-in rechargeable
battery
Sennheiser ensures and guarantees that the rechargeable battery
performs at its optimum upon purchase of the product. If, upon pur-
chase or within the warranty period, you suspect that the recharge-
able battery is obviously defective or if a charging error/battery error
is displayed (> 7), stop using the product, disconnect it from the
power supply system and contact your Sennheiser partner. Your
Sennheiser partner will coordinate the repair/replacement with you.
Do not return a product with a defective battery to your dealer or
Sennheiser partner unless requested to do so. To find a Sennheiser
partner in your country, search at www.sennheiser.com/service-
support.
Outside the warranty period, you can have the rechargeable battery
replaced for a fee by your Sennheiser partner. Contact your local
Sennheiser partner: www.sennheiser.com/service-support.
Installing firmware updates
Firmware updates can be downloaded free of charge from the Inter-
net using the Sennheiser Smart Control app. Sennheiser recom-
mends to always install the latest firmware version to ensure the
best performance of your product.
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Connect the headphones to your smartphone and start the Smart
Control app (> 13).
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The app provides information on available firmware updates and
guides you through the installation process.
