The Botnet is a unit in Watch Dogs 2.
Botnets are the main unit of energy, equivalent to the battery from Watch Dogs. The Botnet is a HUD element that gauges the energy cost when a Profiler skill is used. It then recharges slowly overtime. Marcus is unable to use any Profiler skill for which there is an insufficient Botnet level.
Botnets can be obtained by hacking pedestrians who have them. The main differences are that Botnets come with 4 segments and can be upgraded to 20 segments, as well as having a circular HUD display instead of a battery shaped one.