They said that they are aiming for a battery life similar to that of the DSi, which would put it at about 9-14 hours on the lowest brightness. If they can manage to squeeze about 10 hours from it, I think that would be perfectly sufficient.
Anything less, though, would start to become a tough sell. A good battery life has always been one of the major advantages of Nintendo handhelds and one of the reasons they have always trampled the competition. If they don't want to open a potential window for a competitor, they better keep it at least at a decent level.
Personally, I don't mind a shorter battery life as long as it is closer to the DS than it is to the PSP.
Anything less, though, would start to become a tough sell. A good battery life has always been one of the major advantages of Nintendo handhelds and one of the reasons they have always trampled the competition. If they don't want to open a potential window for a competitor, they better keep it at least at a decent level.
Personally, I don't mind a shorter battery life as long as it is closer to the DS than it is to the PSP.