Advance task Killer is often used to kill app and clean memory. We do suggest people use ATK manually kill apps instead of auto killing app.App killer is only a tool to kill apps and task. It wont help your battery directly. But if you kill any app which consume battery a lot, you might think app killer is helping your battery. Advanced Task Killer Pro is paid version which doesnt contain ads. Download here. Dont forget to login with your 4shared account.