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How do I replace the battery in the iPhone 3G and iPhone 3GS?
However, more affordable -- and often quicker -- third-party replacement services are available and replacing the battery yourself also is possible if you are tech savvy.
The battery in both the iPhone 3G and iPhone 3GS is attached to the logicboard with adhesive, but at least it is not soldered in place like it is in the original iPhone.
Although iPhone 3G and iPhone 3GS display replacement is relatively simple, it is much more complicated to replace the battery.
Replacing the iPhone 3G and iPhone 3GS battery requires one to open the case, disconnect small cables, remove the logic board, and finally carefully pry out the battery. It is challenging and professional installation is recommended.
In addition to its serial number, EveryiPhone.com's Ultimate iLookup feature and the EveryMac app -- available for iOS 5 or later and Android -- can identify each of these iPhone models by Order Number (referred to as "Model" from within the iOS), too.
Although the procedure to replace the battery in the iPhone 3G and iPhone 3GS models is almost identical, the batteries themselves are different.
Consequently, should you opt to replace the battery yourself, make certain that you purchase a battery that is compatible with your exact iPhone. Be sure to also purchase your battery from a company with a reputation for selling quality parts. Low quality batteries not only will work poorly, but might also leak or even cause a fire.
In addition to a professional upgrade service that is not much more expensive than the batteries themselves, site sponsor Mission Repair sells quality batteries for both the iPhone 3G and the iPhone 3GS.
Based on hands-on experience replacing the battery in the iPhone 3G and iPhone 3GS, be very careful when pulling the display away from the housing. Pull with an even, consistent pressure and be gentle to avoid potentially tearing the cables behind the display. These cables are quite delicate and it can be far too easy to damage them when pulling on the display. Also be very careful when prying the battery away from the case and do not use metal tools. Puncturing the battery may cause fire and injury.
This video from iCracked demonstrates the battery replacement procedure for the iPhone 3G and iPhone 3GS alike:
From watching the video, you should be able to determine whether or not you feel comfortable replacing the battery yourself or if you would instead prefer to hire a professional.
Be sure to purchase your repair service or parts from a trusted company with extensive experience repairing iPhone devices.
Site sponsor Mission Repair offers free iPhone hardware diagnosis and a professional 24 hour iPhone battery replacement service by mail in the US as well as inexpensive "do it yourself" iPhone battery replacement kits shipped worldwide.