Used to save power a DSL box, it takes several hours and will keep an internet connection on the mobile devices of the home and autonomous systems (alarms rescued connected self-powered objects ...). If you plan to rescue a desktop PC, go for the immediately higher (few Euros more) which allows communication (USB) with the CPU to set a backup strategy and provides opportunities configuration and logging operation with excellent APC software. Uses a lead battery gel 12V / 7Ah (life expectancy 6.5 years) easy to replace yourself, as found on the Web at around 25 Euros.
