My battery keeps dying quickly; what can I do ?
My battery goes from 100% to 1% within an hour .. what can I do to fix this ?
That's a fairly drastic drop.
You have not told us what model iPhone you have, or how old it is, or what version of iOS it uses.
See this article ...
About the battery usage on your iPhone, iPad, and iPod touch - Apple Support
... although it does sound like you should visit an Apple Store or Authorized Apple Service Center for assistance.
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My battery keeps dying quickly; what can I do ?