Hacking Battery lenght

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Hi guys,

I'm a new guy here.

I have some doubts concerning the ACEKARD 2.1 of mine. How long can you guys play, on a DSLite, using the ACEKARD 2.1, before the battery 'turns red'?
I'm asking because I just recently bought the NDS Lite of mine, and I can play a 'stunning' 4-5 hours before the battery life indicator turns to red! It's just pure insane!
By the way, I have set the 2nd, lowest, brightness setting.

Is there any help for my case? Or should I call Phoenix Wright - THE - ACE - ATTORNEY?

Best wishes for all of you!