You don't, it's part of the device. If you need it replaced you can go into Apple.
You have to have a small screwdriver for the bottom two screws. You take the back plate off after removing those two screws and the battery is right there. This however, voids the warranty.
take to a iphone store
The battery that is most suitable as an iPhone cellphone battery replacement is a genuine iPhone battery from Apple. You should not take the risk of damaging your iPhone by purchasing another type of battery.
The iphone 4 does have a removable battery, but it is difficult to take out and not a typical cell phone battery that you can just pop in and out. It is possible to remove the battery from an iphone 4, but not an easy process. It requires you to pretty much disassemble the whole phone.
The battery should drain slowly on an iPhone 5s. If the battery was charged correctly the first time. It should take around 10 hours to drain.
Replace it when it will no longer take or hold a charge.
The Apple iPhone 6 Plus has a better battery life than the Apple iPhone 6.
a battery
1432 mah battery
No one cares
It can take up to 30 minutes depending on how depleted the battery is.
Not possible.
Yes, you can charge your iPhone when it has a good amount of battery. However, you should avoid charging the phone until it is low in battery, to prolong the battery life.