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I have an iphone 5S. I noticed a faster decrease in battery power. It needs to be charged 3 times a day as compared to my usual once a day while doing the same things on my phone. I changed the battery with an aftermarket one but that didn’t work and fried two charging cables. I have replaced it with a different Iphone battery (used) and still not seeing an improvement, Any suggestions, pointers advice? Thanks everyone.

That’s where I was gonna go with this. I’m guessing you’ve been using aftermarket products. Which is bad for your phone. Use genuine Apple charging cords, and replace with a quality battery iPhone 5s Battery