The Boy Scout’s motto is; Be Prepared. As a speaker this should also be your motto.
A month ago, I attended a presentation by a local speaker at a Historical Society’s monthly meeting. The speaker was told they did not having to bring anything because the Historical Society had whatever the speaker needed.
As the speaker began to speak and advance the PowerPoint presentation, the remote control stop working. It was determined that the remote needed new batteries. For the next 20 minutes while the speaker manually advanced the Power Point presentation on his computer by hand, someone was rummaging through several file cabinets looking for new batteries. This was a total distraction to the audience and for the speaker. A simple solution would have been for the speaker to have brought a small case for emergency needs.
You as a speaker must always be prepared. Spare batteries are one item to have to save embarrassment for you. You may also have a spare universal remote control. An extra flash Drive with your presentation on it is also helpful.
Spend time thinking on what you should bring for your ‘emergency bag’. This may save you from extra stress!