May be a stupid question but I don't do the game thing so I have no idea... I'm getting tired of buying batteries for my daughters Game Boys and was gonna get some NiMH batteries and a charger. I look at the manual and it say to use alkaline ONLY for Game Boy Advanced, and NOT to use NiMH, or NiCad etc...! Is this true or do they just have a pact with the battery companies in order to keep selling batteries? Do the rechargable batteries run hotter or something?