When browsing for my old mobile battery in local electronics mall, I found a spare battery for Javelin/Storm, and the brand name is called Momax X Level. It's got 1300mAh of juice and it cost about only US$15.
Even tho the updated firmware I had already extend my battery life in a great manner, I still interested to buy one of it just for a try.
Sorry about my priviledges that can't post pics, but you can see it down here:
tingcrab.myphotos.cc/webphoto/bb8900Batt-IMG_2796.jpg
tingcrab.myphotos.cc/webphoto/bb8900Batt-IMG_2795.jpg