Sennheiser ADN-W BA Lithium-Ion 7800mAh 12V rechargeable battery

The ADN-W BA Lithium-Ion battery pack is designed for powering the ADN-W C1 and ADN-W D1 wireless conference units. A fully charged battery pack offers an operating time of more than 20 hours. The battery charge status can be checked by pressing the test button or via the Conference Manager software.
The ADN-W BA features two LED indicators for both battery and RF status. The battery pack can be charged separately using the NT12-50C DC power supply or the ADN-W L 10 charger or while inserted in the conference unit using the ADN-W CASE UNITS charging case.