Sennheiser MX W1 Instructions for Use - Page 19

Replacing the earphones' rechargeable batteries CAUTION! Danger of damage to the devices! Rechargeable button cells from other manufacturers may cause damage to the earphones and will invalidate the warranty. ̈ Only use rechargeable button cells recom- mended by Sennheiser (see page 22). ̈ Slightly lift the end of the caps and slide the caps out of the guide rails. ̈ Insert the new rechargeable batteries as shown. Observe correct polarity when inserting the batteries. ̈ Replace the caps ² and slide them onto the guide rails until it clicks audibly. ̈ Charge the earphones until the corresponding LEDs go off (see page 8). Note: The battery caps are designed to fit tightly into the earphones in order to avoid losing the battery and cap should the earphones fall off. Do not open the battery caps unless the battery needs to be replaced. 18