Yep.. i think its normal for camera usage.. it really drains battery quite fast..  around 1-2 hours of usage will eave the battery halves i think.. music on the other hand is okay with me 
This is not normal my friend 
I believe there's a lot 2nd hand 8GB selling for around rm1.8k.. I saw BST ( Buy Sale Trade ) from PJ State branch selling at Rm1700.. full FMG set without warranty card though.. 

Hi, just want to point you to a possible solution to the Garmin v5 causing battery longevity problems. It is widely known in the forums that Garmin v5 has additional services running in the background even though the program is not started. The service in question is CardRunner.dll which resides in the RAM. Its function is a location aware service. It attempts to give your contacts location awareness if they are also using Garmin v5. Deleting this file will solve your problem.

To further improve battery longevity, you will have to shut down a service every time Garmin v5 is closed after usage. I suggest you go to Nokia 5800 owner's thread 1st sticky page for more information. Here's a snip of the discussion: