Hi everyone, so I have a GBA SP 101 that I bought used but EZ Flash IV is new, and I have a Dragon DS 850 mah battery (also new) on it but the thing doesn't last more than 4 hours of playtime. Also the 600 MaH battery that came with it didn't last more than 2 hours! Now I bought another DS 850 MaH battery and it lasts almost 10 hours but it's bulky so I have to use eletrical tape on the back cover to hold the edges down. Is it normal or could my unit be defective? Any help is appreciated.