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.
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usally about 10 hours compared most like the ds lite which lasts about the same time
yes you do waste battery and also if you leave it there to long the battery will die
around 6-9 hours in none standby, 7+ days if in standby depends on how old your ds is
No The First Nintendo DS has a much bigger battery size.
Why would you leave it on anyway? And yes it's bad. It wastes battery, and your ds can only last 500 charges before it starts to stop working.