When a phone reports that there is 0% battery life left, there is actually about 20% left at low voltage. They decided to leave that unused so you don't need a new phone every six months. i*****s get their "good" battery life by lying on the battery meter and dipping into this power. That causes the batter to only go through 10% all day, but then 90% at night. The i***** gradually stops doing it in the course of several months so the user doesn't notice. Also, the chips throttle at low power levels, and a throttled i***** is extremely slow. Also, iOS runs all your apps in the background for faster load time. The more apps you have, the worse your load time. On Android, devs can opt out of that. So don't buy i****.