Re: Batteries not required
Granted these days there's redundancy with booking info held on laptop & phone(s), but years back (Before smart phones) on a trip to Canada we had a thunder storm, the storm finished & was travelling to the East. Shut down the laptop.
Next morning totally dead & never computed again.
Thank goodness for my foresight of printing out the itinerary & booking info, else time would have been spent trying to find a friendly PC shop to extract the Excel spreadsheet from the HDD.
Recently had to go back to carrying paper copies with all the various Covid tests & vaccination proofs, in addition to copies held on laptop & phone.