Progo NP-FW50 Battery for Sony NP-FW50 and Sony Alpha NEX-F3, NEX-6, NEX-5, NEX-3, NEX-C3, NEX-C5, NEX-7, SLT-A33, SLT-A37, SLT-A55, A3000, &alpha;7, Cyber-shot DSC-RX10 Cameras, Retail Pack. Progo Li-ion Rechargeable extended power battery for Sony NP-FW50 Integrated microchip prevents overcharging, overheat & provide short circuit protection. High quality Li-Ion battery cell for longer battery life Absolutely no memory effect so that you can charge battery at anytime One year manufacturer warranty