My iPhone 7 battery is draining while not using the phone

AppleBoss ~ Does your iPhone 7 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

...And is there an "Important Battery Message" there? [Ref: Apple]

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That's normal. Unless the phone is turned off, it's doing things in the background.

See here:

Batteries - Maximizing Performance - Apple

AppleBoss1234 wrote:

Bro I think the problem is with charging cable I am using 2.4A cable is that the problem or any other

Please do not assume my gender.