Power up with the UltraFire 10440 Rechargeable Battery! With a capacity of 500mAh (actual 320mAh) and a rated voltage of 3.7V, this battery ensures reliable performance for your devices. Its compact design (46mm x 10mm) makes it easy to carry, while the CE, FCC, MSDS, and UN38.8 certifications guarantee safety and quality. Perfect for powering your everyday electronics!