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I just assumed he will use his batteries together so that they sum up the voltage.

Then you should use a power regulator like an 7805 or 7808 to get to 8V.

What batteries do you use?

Just a wild guess: Shortages? Did you try another controller?

Same for me
Hopefully my ordered screen is satisfied with something like 9V as mentioned here:
http://forums.benheck.com/viewtopic.php?t=42870" onclick="window.open(this.href);return false;