Rechargeable battery for Sennheiser HDE 2020-D-II headset 3.7V 820mAhWith the replacement rechargeable battery for the Sennheiser Tourguide HDE 2020-D-II system headset, you always have enough power for your events and guided tours. The battery has a voltage of 3.8V and a capacity of 820mAh, which ensures that your system headphones are always ready for use.The battery is of the lithium polymer type and has short-circuit, overvoltage and overheating protection, which ensures a long battery life. You can count on a reliable power supply even for longer periods of use, and another advantage of the replacement battery is the lack of memory effect. Thanks to the rear housing, the battery can be easily and safely inserted into the Sennheiser Tourguide HDE 2020-D-II system headphones. Benefit from the mobility and flexibility offered by the rechargeable battery and stop worrying about insufficient power supply during your events and guided tours.Suitable for:✓ without memory effect✓ long service life✓ high-quality battery cells✓ short-circuit, overvoltage and overheating protectionBattery with bottom coverTechnical data Voltage:3.7 V Capacity: 820 mAh Contacts/cable: 2 System: Lithium polymer Dimensions (LxWxH): 76.5 x 59 x 7 mm Weight: 34 g.