Battery life is listed, not sure if posted? 3-5 hours for 3DS games. Something abotu 3 and a half hours, but not sure.
Also, this is what's in the box:
Nintendo 3DS body
Nintendo 3DS charger stand
AC adapter for Nintendo 3DS
Nintendo 3DS dedicated stylus
SD Memory Card (2 GB)
AR cards (6), reflecting the play outside the camera using the compatible software.
Quick Start Guide
Nintendo 3DS cameras, Nintendo 3DS sound, Mii studio, Mii Plaza chance encounter, AR Games, Kiro book please remember, shooting and face