Quanta Vici Smart Heated Wear Rechargeable Li-ion Batteries for Gloves and Socks.

• Using life: 500-600 cycles of charging.
• Please charge every six months during storage.
  
  
• Working temperature: - 35℃ to 55℃

• Certifications: MSDS, UN38.3, FCC certification.
• 7.4 Volts