I havent replaced mine but I have RMA'd it after two weeks of trying to figure the battery out from new.
Sometimes it would fully charge, other times it would only charge to ~70% , and other times it would show 100% charge only to drop down to ~63% after 10 minutes after charging overnight.
Towards the end I thought I had it figured by charging when in 'deep sleep' mode, but that didn't work so I rma'd it.
At present I am waiting for their response.
I think you have a calibration problem, you could reolve it with the application "battery calibration" on google play_______________________________________________________________________________________________________________________samsung galaxy s5 ipad mini ecran retina