Please Notice :        
The Tools is free , so i can't Promise tools will be suitable for your Device,        
I hope it useful for you ,Hope you could understand        

Product Description:       
Replacement Battery Model : AHB413645  CP-SN55  
Battery Capacity : 3.7V 1000mAh 2.59Wh       
                          
Compatable with : For Sennheiser PXC550 PXC 550 Wireless Headset

Package include:       
1 x Replacement 1000mAh Battery        
1 x Free Tools