When Apple unveiled the iPhone 4 on June 24, 2010, it also changed the battery that was in previous iPhone models. The iPhone 4 has a capacity of 16 GB or 32 GB. The iPhone 4 battery replacement unit is a 3.7V 1420 mAh Li-Polymer cell battery. The iPhone 4 battery replacement is a little easier than replacing the battery with older 3G or 3GS versions and is certainly easier than the iPhone 2G.
If you're simply working on rather small electronic units, you can order an iPhone 4 battery replacement kit. This replacement kit includes the battery, a plastic case for removing the back panel, sometimes an iPod docking device, a Phillips head screwdriver size of # 009, or because part of the iPhone 4 has an iPhone 4 5-point screw called a pentalobe screws you will need the iPhone 4 5-point screwdriver to remove these screws. The kit must include a tutorial or provide an online site that contains replacement instructions in video or image format.
When replacing the iPhone 4 battery, you must remove the back cover and remove the battery. Let's start by making sure iPhone 4 is turned off. Then remove the rear panel by removing the outer screws near the docking connector. Then press the rear panel to remove it. Then remove the screw connected to the battery connector on the system board. The battery should be pulled very carefully so that it can not be pulled out or pulled out. Also remove the antenna connection. Then, remove the battery with the plastic tab facing upwards. Again, this should be pre-calibrated to prevent any damage to the back of the iPhone. When inserting a new battery, you must reverse this procedure. Of course, if you do it, you may void your Apple warranty.
As Apple usually has a one-year warranty, if the iPhone is less than one year old and it's up to you to buy it now, just send it back to Apple for exchange because it's the safest way. But when you return your iPhone from Apple, you will not have any data, so make sure you have all your data created using an iTunes backup. Make sure you back up your iTunes, contacts, photos to keep, email account settings, text messages you want to save, etc. If you decide to send your iPhone to a third-party repair site, such as an iPhone specialty repair site, you can regain iPhone 4 with your restored data. If you choose this path, you should remember to send them the unlocking passwords.