I don't understand, what is the extended battery for Galaxy Nexus i9250?

My husband got one and the battery dies mid day. Been doing some research and I found that it has additional battery or something like that??



Thanks.I don't understand, what is the extended battery for Galaxy Nexus i9250?
The regular battery is 2000mAh and the extended battery is 3850mAh. This rating means you can pull 1 amp for 2hours regular battery and 1 amp for 3.8 hours on the extended life battery. If his battery is dying after about 4 hours, then follow these guidelines for more battery life: http://www.apple.com/batteries/iphone.ht鈥?/a>

just tires

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