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CS-ETC800SL : Battery for Eartec ComStar Wireless Headsets - Replaces Eartec CS-800LI Sennheiser Office USB The CS-HTM110SL is a replacementThe CS ETC800SL is a replacement rechargeable battery for Eartec products. This battery replaces the following OEM part number(s): Eartec CS 800LI This battery is compatible with the following model(s): Eartec ComStar Wireless Headsets Specifications: Voltage 3. 7V Chemistry Li Polymer Capacity 950mAh Dimensions 43. 00 x 35. 80 x 13. 00 mm Color Black Weight 52 g