How can I downgrade iOS 9.3.5 to iOS 9.2 on my iPhone 4s?

I own an iPhone 4s and I want to downgrade my current iOS version, which is iOS 9.3.5, to version 9.2. The reason is that my battery is draining very fast on the new version of iOS. Any alternative solutions would be appreciated as well.

from Android Forums at AndroidCentral.com - Ask a Question http://ift.tt/2bUE1qV
via IFTTT