This has been my tried and true method for determining what 9Vs are good enough to use for the next show. You can take my built-in battery tester over my slightly electrocuted body.
Trump administration is going to fire the social media person at USCPSC and put out new 'guidance':
"THE WOKE LEFT HATES FREEDOM!!! IT IS TOTALLY FINE TO LICK BATTERIES!!! MLBGA (MAKE LICKING BATTERIES GREAT AGAIN)!!!!
THANK YOU FOR YOUR ATTENTION TO THIS MATTER!!!!"