Your phone comes with a non-removable battery.Here is the picture on how to insert the micro sd card.
Hope this helps
I'm sorry to hear that you are having issues with the back cover.
If you will please let me know if you are referring to the Micro SD, or the CD DS car adapter.
In order to remove the back cover to access the micro SD card, the top of the back cover is the only part that is removable. As with the previous EVO, place your finger nail or an object with a flat surface into the groove on top of the device, facing the rear of the device. The back cover pops up and the micro SD slot is there just to the left of the camera lens.
Hope you find this helpful!
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.