No,but only unless you have the DSI shut.
No because it freezes
The Nintendo DSi does indeed have a built in alarm clock. It is accessible from the System Settings Icon
no it does not
battery world
look at the upper edges of the dsi
You have to take out the battery in the DSi. Do this by screwing the screws out.
when the dsi freezes you have to unscrew the battery out and unplug the charger the dsi should turn completely off wait about ten seconds and screw the battery back in.
The DSi is internet enabled already, no messing around with the battery is needed.
Take out the battery, or wait until the battery runs out of power.
Buy a new one. Sorry, but the dsi has no way of tracking it.
The DSi XL runs on a proprietary Nintendo battery which is removable and rechargable. It is lithium-ion, 3.7v, with a capacity of 850mAh.
If you set the alarm (i.e. lock the car) and then disconnect the battery, the alarm will go off. If you disconnect the battery when the alarm is not set (i.e. when the car is unlocked) the alarm will not go off. (So don't try to nick a locked one).