I need to find a 19.2 V battery and remote for my Hummer H2 Mud Slinger. Where do I look?

A 1:14 Mudslinger requires a 6 Volt battery. Not a 19.2 Volt. Now when you go purchase this battery make sure it says 6 Volt not a 6 Cell. Here is the style battery you need. http://www.all-battery.com/6vrccarreceiverbattery.aspx
Starting from the top left you can choose the first 5 depending on the shape of the one you have for the RC and the mAh you want. The term mAh indicaters milliamp hours. Basically how long the battery will last. More bang for your buck basically. But they cost more too. They will all function the same. But the ones with less mAh will run out of juice sooner and have to be charged. All these connect the same way from the same style connector. So don't worry about that. Hope this helps.
Regards, Tony

What kind of battery 9,6 volt i need to buy for a New Bright Hummer H2 (the chemistry of the battery) ?

Hey, you can try ebay, Amazon or Google shopping.