Battery replacement effect on authentication apps
I have an iPad, original 12" iPad Pro (also an iPhone). Am PC user due to work requirements, so little understanding of Mac.
iPad battery is down to 4 hours between charges. Am guessing I need battery replacement.
I have back up to iCloud turned on. However, I don't understand implications to authenticator apps. I have three including Google, Microsoft, and Norton. I understand at least Google is not backed up. Not sure of the others. I see discussions of recovery codes, but find while I have such codes for Microsoft, Google and Apple accounts, I have nothing that says codes apply to authenticator apps.
My questions then:
1) Assuming "things go right", is there any loss of data or capability of these apps with loss of power due to battery replacement?
2) Assuming "things don't go right", what should be done to be in a position to recover?
3) Is there any security concern with having these apps in place on the unit while out of my control at repair facility?
Thankyou
iPad Pro, iPadOS 16