If after replacing with new battery then your smartphone (mine is sony experia Z1) can not turn on and if charged, only showing blinking red light 3 times and nothing happens, it means that the smartphone’s system gets no power at all, and definetely means that the new battery is defective…. If not defective but only flat / drained new battery then it can be back alive / start charging after around 30 minutes initial charging… I experienced the same and after asking for replacement new battery from the store, I now have a like-new-Z1.