That assumes you're using it on the lowest setting. The brightest setting on the DS lite only gets an estimated 6 or 7 hours, and I've found the brightest setting on my DS lite to be about the same as level 3 on my 3DS: 5 hours to 7 hours is a much more favourable comparison, considering all the extra features on the 3DS, I think. The DSi is apparently even worse at the brightest setting than the DS lite, but I never owned a DSi so I don't know how it compares to the 3DS. From the numbers, I'm guessing the DSi is also extremely bright on the brightest setting and I would have to turn it down a bit.5 hour 3DS battery life is crap compared to (DS lite/DSi/DSi XL)'s 10+ hours.