Motorola MOTO E Troubleshooting Manual page 17

The Moto E 4th Gen does have a removable battery.
To remove the battery, first remove back cover:
Don't be afraid to use a little musle!
Then, remove the battery using the notch in the bottom as illustrated below:
To re-insert the battery, reverse the process starting by putting in the top of the battery, first.
Clear Cache Partition - Moto E (4th Gen)
How do I clear Cache Partition on my Moto E (4th Gen.)?
When you perform a clear cache it will remove any temporary files that may be causing
a problem, but will not delete your files or settings.
To perform a wipe cache partition:
1. With the phone powered off, press and hold the Volume Down button and the Power button at
the same time until the device turns on.
2. Press the Volume Down button to highlight "Recovery mode"