Nokia 5800XM High Performance Battery

Nokia 5800XM High Performance Battery
I saw this advertisement and also some of my friends in Malaysia using high performance battery on their Nokia 5800XM phone. Whereby the standard power output allowed to the device is 3.7volts @ 1320mAH. However, these users bought higher performance battery (linked example below). My question is:
1. Does this allowed by Nokia to be used by end-users on the device?
2. Any side effects technically on long term use?
3. Does Nokia covers warranty on this issue?
Example seller link: http://www.valuemax.co.uk/product_details.php?id=15835
Note: I prefer some senior members / Nokia staff to reply on this topic.
TQ .. XM
I'm an Xploit - Please feel free to post your issues, feedbacks in this discussion forum and I'll do my level best to help, otherwise my knowledged friends whom are around willing to help you. Thank you !

Using this battery in and of itself will not have any impact on your warranty.
However, if the phone is damaged through use of this battery (eg. electrolyte leakage or explosion!) then it will not be covered by the warranty.
I actually have one of these batteries and I'm pleased with it. Please do note, however, that the camera window is poorly designed making flash photography impossible. There is no insulation between the flash and the lens meaning that light from the flash floods any photo taken using it. It has no discernable impact on daylight photography, though.
http://www.flickr.com/photos/grshorwich/sets/72157622653165321/
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    Steve

    Direct you to the proper forum for MacBook :
    MacBook Series Forumshttps://discussions.apple.com/community/notebooks?view=discussions
    http://www.apple.com/support/macbookpro
    Mac OS X Forum
    https://discussions.apple.com/community/mac_os?view=discussions
    This forum deals with a desktop/tower 65lb Mac Pro
    http://www.apple.com/support/macpro

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