Hawk-Woods BP-75U (BP75U) Lithium-Ion Battery Pack (75Wh) (Sony BP-U Type) (75Wh). The Hawk-Woods BP-75U has been designed, manufactured and tested to be a direct replacement for Sony BP-U type batteries. 
With a built-in fuel gauge & Hawk-Woods build quality, the high-tech Li-Ion BP-75U camera battery offers stunning performance for its size and weight and unlike many replacement BP-U batteries on the market, the BP-75U uses the original battery contacts to provide power, rather than a flying lead connected to the devices DC power input. 
The BP-75Us built-in Total Battery Protection system offers over discharge / voltage protection (If placed on unsuitable / incorrect charger), short circuit protection and thermal protection. 
COMPATIBLE WITH THE SONY PXW-FS7