Im not sure how many of you still have this issue, or have upgraded to next revision of this tablet. I bought it for a replacement as Im upgrading shells an replacing a keyboard on my white acrylic macbook. Ive been sooo disappointed with its performance

I too had this charging issue. at first it took a few hours to charge, then 8! then only to 13%. I saw others had same issue. i think, when it is loaded with apps the battery drain is huge. might only be one app causing the drain. However, I am a mfg tech, trained from the ground up. plugging in parts for circuit boards to high tech machines to board level repairs to reverse engineering. 35 yrs. I never recommend tearing into equipment unless you actually have confirmed the issue warrants that. research is the best way to discover a good fix, unless you have everything at your finger tips and can do diagnostics.. but I also believe never take no for an answer. which brings me to this fix.
if it is a charging issue, most likely not the internal battery. I have been struggling to like this device lol. No charge, then would charge tells me after trying a few different tests, that it is internal but not the battery. more than likely the 6 pin regulator is wrong out put for the battery. Finally saw the post by a guy who figured it out, more or less confirming what I was thinking. these tablets dont charge well with USB charger that comes with. 5.0 volt 2a is not enough. you need to buy the "super charger" as its called...5.3v to 5.5v 2A...standard wall plug connection with 30 pin connector to device. google it.
bam! This thing charges like a dream. I think it is a bug they didnt fully research when designing this model. I have no idea what the newer ones do.if they have same issues, but this thing fully charges in a couple hours. also, I couldnt multi task. would drain in a few minutes. now it charges while you do other things. so far problem fixed. crossing my fingers. oh and follow the directions...remove the new charger from power first, then disconnect the 30 pin connector from device pulling straight out. Pulling it away and out at an angle can mar your connection fingers that mate with the 30 pin connector, causing a bad connection. this is not a USB charger. ac wall mount w/30 pin connector. only cost 8$ free shipping