Just something to be aware of, especially if you have a 6s or 6s+.
Apparently, the diagnostics that Apple uses during battery replacement requires your device to be running on iOS 10.3 or newer. So, if you're device is on iOS 9 and it's jailbroken, you are going to lose your jailbreak.
https://www.reddit.com/r/jailbreak/comments/a09f0p/discussion_apple_updated_my_iphone_6s_from_ios/
Apparently, the diagnostics that Apple uses during battery replacement requires your device to be running on iOS 10.3 or newer. So, if you're device is on iOS 9 and it's jailbroken, you are going to lose your jailbreak.
https://www.reddit.com/r/jailbreak/comments/a09f0p/discussion_apple_updated_my_iphone_6s_from_ios/