DS: 7-9 hours
DS lite: 8-10 hours
DSi: about 12 hours on low brightness. High brightness around 6 hours
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The Nintendo DS battery has been made to be recharged around 500 times, after which the battery life will be 70% of its maximum charge. The length at which a rechargeable battery will last depends on how frequently you charge it. For older devices, it is usually recommended to allow the battery to drain as much as possible before recharging.
you can not charge it without a charger it will die out without one
3 hours but if you play the ds while its rechargin then it takes longer
No do not charge your DS right away. Wait till it becomes very low and then charge it.
I have a DS and it takes obout 2-3 hours. I also have a DSi and it takes 2-4 hours.