slow charging rate and battery drain fast

I would like to ask some questions..my iphone 5s with ios9.1 have a problems.

i have update for a few weeks ago.

the problem just occur.

the problems are slow charging rate and battery drain fast.

i just change the new battery but the problem still not solved.

then i also try off data and not use the phone for 2 hours..

after 2 hours i monitor my battery drop from 97% to 77%..

if there any problem with my iphone..

thank you..