Introducing the M3 Mobile spare battery, an extended 5100 mAh battery specifically designed to fit the BK10. This high-quality spare battery from M3 is perfect for extending the battery life of your device, ensuring you can stay connected and productive for longer periods of time. Weighing just 0.12kg, this spare battery is lightweight and easy to carry with you on-the-go. Don't let a low battery hold you back - upgrade to the M3 Mobile spare battery today and experience extended power and performance.