Recall the first normal attempt
Note whether the wall control responded, whether an indicator changed and what the motor did. Stop repeated attempts if movement is abnormal or the door looks damaged. A concise account of the sequence is more useful than a list of parts guessed from online examples.
Keep the equipment details ready
Provide the opener model and mention whether backup equipment is installed. Tell the provider about any earlier intermittent issue as well. This helps separate a newly noticed fault from a problem that may have been developing before the loss of power.
Ask for the assessed cause
Before buying a replacement board, battery or complete operator, request a clear explanation of the finding. Have any proposed accessory identified by compatibility. Keep the repair record so a recurring problem can be discussed against the work that was actually completed.
Your questions
Does this prove the opener suffered electrical damage?
No. The sequence alone does not establish a cause. The equipment needs assessment before a failed component can be identified confidently.
Should I replace the backup battery immediately?
First check the model’s guidance and have the actual fault established. A battery purchase may not address the reason normal operation has not returned.