Honeywell DOLPHIN CT50 User Manual page 30

Chapter 1 — About the Computer Features
20 Dolphin CT50 Mobile Computer with Windows 10 IoT Mobile Enterprise User Guide
3 Press in on the door lock and slide the battery door toward the
bottom of the computer to unlock the door.
4 Lift up on the edge of the battery and remove it from the computer.
5 Press down on the SD card door and slide it toward the top of the
computer to open it.