the new DSi :D

It has more battery life. It also weighs a tonne.

The NEW DSi

# Minimum brightness of about 13 to 17 hours
# 低輝度　　 約11～14時間 Low intensity of about 11 to 14 hours
# 中輝度　　 約9～11時間 Brightness of about 9-11 hours
# 高輝度　　 約6～8時間 Approximately 6-8 hours high brightness
# 最高輝度　約4～5時間 Approximately 4-5 hours highest brightness

The DS Lite

# Minimum brightness of about 15 to 19 hours
# 低輝度　　 約10～15時間 Low intensity of about 10 to 15 hours
# 高輝度　　 約7～11時間 High brightness of about 7-11 hours
# 最高輝度　約5～8時間 Approximately 5-8 hours highest brightness


I rest my case.