No it isn’t. but the black rubber around it makes it really hard to get out. try to push it from the otherside by removing the charging-port.

Be careful not to pierce the battery

In my case there was no way to get the Battery out this way as it was a bit bloated and thus stuck.

By removing the cap on the other side and removing the Charging Port I was able to push it out with the thick side of my screwdriver.

I also have a slightly other version of the body where the caps are hold by a rotation/clipping mechanism not by screws