I have replaced the old battery with this new battery from iFixit. I used my phone down to 2% and then charging for the first time. It only takes 1 hour and 30 minutes to fully charge! After 30 mins using, open 1 web page, no app running background except safari, wi-fi on, 40% brightness, location off, cellular data off, the battery down from 100% to 85%, is this normal?