My Cyberpower UT800EG 800VA/400W UPS has been serving me well for more than 3 years, and it is still functioning well.It has never failed to protect my Dell XPS 8930 desktop, my Asus RT-AX86U router and Unifi BTU from sudden blackouts and also voltage spikes during thunderstorms.Anyhow, I anticipate its internal battery, which is not user serviceable, has already reached more than half its