Auto-Sync can be useful for apps like Gmail that connect frequently to servers to update your mail. But it can also be a battery draining nightmare. Here's how to turn off Auto-Sync and save your Android phone's battery's power.
1. Go to Settings then Accounts and Sync.
2. Deselect the box for Auto-Sync.
Now your Android phone might last a while longer without needing another charge.
Disable Auto-Sync on Your Android Phone | Laptop Mag