how can we distinguish i phone original battery to the duplicate one
how can we distinguish a original battery of iphone to its duplicate one by its physical appearance?
iPhone 5c, iOS 8.2
You can't. Apple does not sell original spare parts, the phone is not supposed to be serviced by the user, even battery replacement has to be done be Apple or an Authorized Apple Service Provider.
Opening the phone will void the warranty and any other service options given by Apple.
Replacing the battery will cost you $79 and comes with a short warranty period as well
Find an Apple Authorized Service Provider
iPhone - Contact Support - Apple Support
Out-of-warranty repair service
If your repair isn’t covered by Apple’s One Year Limited Warranty, AppleCare+, or AppleCare Protection Plan, your iPhone might be eligible for out-of-warranty service. For example, liquid damage isn’t covered by warranty but might be eligible for out-of-warranty service. Some damage isn’t eligible at all, for example if your device has been broken into multiple pieces. See Apple’s Repair Terms and Conditions for complete details.
Read Apple’s Repair Terms and Conditions
Model Out-of-warranty service fee Battery service* iPhone 6 Plus $329 $79
*available only if battery
fails Apple’s diagnostic testiPhone 6 $299 iPhone 5s, iPhone 5c, iPhone 5 $269 iPhone 4s $199 iPhone 4, iPhone 3GS, iPhone 3G,
Original iPhone$149 Plus a $6.95 shipping fee, if required. Fees are in USD and exclude local tax. Pricing is for service through Apple. The final service fee we charge will be determined during testing and may be less than the service fee listed above. Pricing and terms vary for service through an Apple Authorized Service Provider.
copied from Service Answer Center - iPhone
