okay after making some observations:
DO NOT USE THE INCLUDED CHARGER EVEN IF ITS THE "REAL" (with the stickers) ONE!
at first i used the included charger coz that was the only wall charger that charges my dingoo :
BUT lately i noticed that i can smell the "burnt plastic" thingie when i was charging my dingoo - very dangerous!
and also, no matter how long you plug the charger, the dingoo will never show the "Battery full " logo - it will keep on charging the dingoo! (thats why its dangerous!) it charges the dingoo very quickly (empty to 267000) within 2 hours, but it will never show the battery full logo
now i use my iphone charger with a different usb cable - works awesome!
note to people : if you think your usb wall charger is not charging your dingoo, try a different cable!
i used a midi cable that came with my akai drum pads and they work perfectly - the ones that came with the dingoo didnt do it well