The Sony NP-FZ100 is a high-capacity rechargeable lithium-ion battery that powers many of Sony's latest full-frame and APS-C mirrorless cameras, as well as some of their Cinema Line cameras. It's become a standard power source for Sony's more recent professional and enthusiast-level cameras.
 
Compatibility:
Sony α7 III  / Sony α7 IV
Sony α7R III  / Sony α7R IV  / Sony α7R V
Sony α7S III
Sony α9  / Sony α9 II  / Sony α9 III  
Sony α1
 
Note: This is a slightly used product extracted from cameras that have surplus batteries but in excellent condition. It is tested and is working perfectly.