On 01/01/2016 06:27 PM, Andreas Reschke wrote: > Hi there, > > I've build my own webserver (thanks to Robert Moskowitz) with the > cubietruck. I've bought a LiPo UPS > (http://www.pollin.de/shop/dt/MTU3NzkyOTk-/Bausaetze_Module/Entwicklerboards/Cubieboard_3_Li_Akku_3_7_V_5_3_Ah.html) What you have bought is a 5.3Ah rechargeable battery, not an UPS. An UPS has its own electronics. > My search at the internet found, that with Cubian or other Debian-based > OS there is way to monitor the powerpack with "cat > /sys/class/power_supply/battery/uevent". > > How tho manage it with CentOS? There is no such directory. start by looking below /sys/class/power_supply/bat* and verify what exists over there. If there is NOTHING looking as what you need, it might be that the kernel lacks some config options.