Logitech M505 User Manual page 7

6. Replace the battery hatch and apply downward pressure to the LASER logo to lock it into place.
You should hear a "click" when the hatch is locked into place. This will protect the internal
components of the mouse and make the mouse more ergonomic during use.
CAUTION:
If the hatch does not lock into place easily, it may have been replaced
incorrectly. Do not force the battery hatch, or you may damage it!
Instead, remove the battery hatch from the mouse and try Step 6 again.
7. Turn the mouse over so that the on/off switch is visible. This will allow you to switch the mouse
on.
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