iOS 10.0.1 ***** my iPhone 5s battery worsely

Dear fellas

I am using 2.10 years old iPhone 5s running iOS 10. at 3G, it cant even pass through 8-9 hours. ( averages 7.5 hours with very light usage includes phone calls, whatspp, iMessage). Very tough.

When i checked with 3rd-party app "Battery Percentage", it shows my battery wear-level is 29% .

Suggestions please! Do anyone of you faced similar problems? What should i do now?

PS: already tried many battery saving tips, restores. Din work.