The 3DSXL will come with a bigger battery, however the bigger screens will probably level off that benefit.
I dont mean to be a douche, but you can just probably order a 3DSXL from the US site and get the charger. And aftermarket chargers are like 4 bucks tops, so really not a huge deal. It is kind of dumb that you have to go to the trouble for your own charger, but hey, Nintendo is nintendo.