In order to mitigate the chances that my batteries in my calculator will die mid-exam, I changed mine this past weekend. I’m fairly sure that they’ll last through June 1.
Trust me–if you have the TI BA 2 Plus, you don’t want to change batteries mid-exam. You have to have the right-size screwdriver, and even then, it takes a looooooong time. And it causes stress. These are two things which are already working against you on exam day, so go ahead and change those batteries now.
NOTE - this is one distinct advantage that the TI BA 2 Plus" Professional" has over the “regular” 2 Plus. It takes 5 _ seconds _ to change the batteries in the Professional. It takes 10-15 minutes with the “regular”.