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Refer to the diagram on the holder to orient the batteries properly. Replace the holder back into the battery compartment and replace the lid. For reference: the battery pack fits in with wires on the bottom right. (See arrow in photo). Use only fresh batteries. Using old or low batteries may cause error messages. An optional AC adapter and 12V car plug cable are also available for purchase at #2 knob Step 5. Attach telescope to mount using dovetail lock knob (#2). iOptron Corp. | 6E Gill Street