JabaClinton Said:
"My Iphone 7 gets Switched off Suddenly. and battery does not long for much hours?: Battery health I see 100%. Its a second hand mobile.. 3years old.. is there a possibility they have changed local battery?"
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Location of Purchase:
Interesting. So, just where did you purchase this battery? If it was from online, or in the middle of the mall (an independent seller), then it my not be trustworthy. So, take it to Apple, or contact your local retailer. That may do the job, as it would be more trustworthy, and they may offer guarantee for a few.