IGN has posted thier hands-on impressions, here
They report that the battery is NOT changable.
They also address the shoulder buttons, saying they look wierd but feel perfect for either knuckle use or finger tip use.Interestingly, the Game Boy Advance SP system features a built-in rechargeable lithium battery that's not user-swappable. If something goes wrong with the battery, users will have to send their unit to Nintendo for a replacement. The battery door on the bottom of the unit is sealed with a tri-wing screw, which makes it difficult for the end-user to access.
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