If you want to do a test run without third party apps but avoid factory reset, you can reboot your device into "safe mode".
This will turn off all third party apps for the next boot and then on the next reboot all apps will be back again. This is good to check battery life or any weirdness that you are not sure if it caused by any of the third party apps.
To do so, at the power off dialog, click and hold "Power off" item until the dialog pops up.
