Suitable for the following models: Compatible with Sony BF-TDSY Compatible with Sony MDR-DS3000 Compatible with Sony MDR-DS4000 Compatible with Sony MDR-IF140 Compatible with Sony MDR-IF140K Compatible with Sony MDR-IF240R Compatible with Sony MDR-IF240R?K Compatible with Sony MDR-IF240RK Compatible with Sony MDR-IF3000 Compatible with Sony MDR-IF540R Compatible with Sony MDR-IF540RK Compatible with Sony MDR-RF800R Compatible with Sony MDR-RF800RK Compatible with Sony MDR-RF820 Compatible with Sony MDR-RF820R Compatible with Sony MDR-RF820R?K Compatible with Sony MDR-RF850R Compatible with Sony MDR-RF850R?K Compatible with Sony MDR-RF885R Compatible with Sony MDR-RF885RK Compatible with Sony MDR-RF920RK Compatible with Sony MDR-RF925RK Compatible with Sony MDR-RF960R Compatible with Sony MDR-RF960RK For guaranteed compatibility, please check under Replaces the following original models: if your current battery is listed. 1.2V/700mAh Replacement Battery for Sony BF-TDSY, MDR-DS3000, MDR Compatible With BF-TDSY 700mAh Replacement Battery For Sony BF-TDSY, MDR-DS3000, MDR-DS4000, MDR- IF140, MDR-IF140K, MDR-IF240R, MDR-IF240R?K, MDR-IF240RK, MDR-IF3000, MDR-IF540R, MDR-IF540RK, MDR-RF800R, MDR-RF800RK 700mAh Ni-MH Rechargeable Battery The CS-SRF820SL is a replacement rechargeable battery for Sony products.This battery replaces the following OEM part number(s): Sony BP-HP550 Sony... Weight: 36 g Net weight: 11 g Capacity: 700 mAh. Brand new, premium-quality replacement battery for CS-SRF820SL wireless headset. Fully compatible with original equipment and built for reliable performance and durability Voltage: 1., 2 V., Technology: Ni-MH Power: 0., 84 Wh., Colour: black.