Describing main/major and minor parts/components

The major component of this apple iphone is battery.Battery for apple iPhone 3G offers up to 5 hours of talk time on 3G, 10 hours of talk time on 2G, 5 hours of Internet use on 3G, 6 hours of Internet use on Wi-Fi, 7 hours of video playback, or 24 hours of audio playback on a full charge at original capacity. In addition, iPhone features up to 300 hours of standby time.A properly maintained iPhone battery is designed to retain up to 80% of its original capacity at 400 full charge and discharge cycles.The battery type of apple iphone is lithium-ion.Its input and output is 5 volts.It have black and chrome frame colours.