alfredofroylan on 07 January 2011
Check the Japan info thread guys:
The battery life varies depending on the brightness of the screen ※.
※ The approximate battery life. May be less depending on operating conditions.
http://gamrconnect.vgchartz.com/thread.php?id=122520&page=5
Basically battery life depends on the setting (bight, Wi Fi, etc.) Nintendo even claims that the DSi has a battery life of 4-5 hours
