People complain about how the Sony PSP’s battery lasts for only 3 hours while the Nintendo DS lasts for 8. Well I have had the PSP for a few months now and I never had a battery issue because I was always able to charge the battery before it got low enough to cause me a problem. Awhile ago I was playing with my Nintendo DS and suddenly the green battery LED turned red. So I figure this must mean I have like 2 hours of playtime left before the battery dies. I was wrong, 20 minutes later my DS died!
There is no way to know exactly how much power is left in your DS until the red light comes on and only then do you know that you are fucked. Atleast with the PSP in every pause screen of any game you can see the battery meter on the top right corner telling you exactly how much battery is left.