Portable and user friendly design Compact, sturdy and easy to use; large LCD display, built-in LED light for ambient and emergency lighting. 8.4L b lightweight and small footprint. Long Service Lifetime with Smart Stable Power - Designed for 2, 000+ charge/discharge cycles or 10 years service life. The internal smart battery management system manages and protects against overloading, over discharging, overcharging, overheating, and short circuits for long-term reliable power performance.