I have seen similar features on phones. Luckily my LG G4 has replaceable batteries. I can confirm that multiple times I have seen my battery reported as fully healthy, only to open up the phone and find a spicy pillow.
So it may be useful for some things but I would not be too heavily reliant upon this without fully understanding where that % comes from.
Funny because Faking Gong believes Trump is a divine intervention to bring down the CCP.