If it is saying that the battery is dying that fast, then one of the following is probably the issue.
1. You have an app, or apps, that are serious power hogs and are draining the battery. Then you would need to figure out which one(s) it is and uninstall them.
2. You are not fully charging the battery before using it again, so that it never actually gets a full charge.
3. The battery is faulty or dying and needs to be replaced.