The battery cover for the CAT B25, a rugged mobile phone manufactured by Bullitt Group with the Caterpillar license, released in 2013.
It has a rubber gasket around it to provide IP67 dust/water resistance and 2 screws to hold it in place.
<a href="//commons.wikimedia.org/wiki/User:MarcoTangerino" title="User:MarcoTangerino">MarcoTangerino</a>
<span class="int-own-work" lang="en">Own work</span>