Possible unable to charge fix??

Just experiencing the drain of death...

Backstory:
Bought this tablet at a pawnshop and battery was dead for 10$.
Came home and recently had pulled a pile of USB chargers out of the dumpster.
Plugged it into random charger.
Let sit for couple hours, got battery ? sign.
Left over night, battery with critical red sign.
Left another day and almost 35% charged and then was able to turn on.
Corrupted android install and rescue.
Few days of searching, found all the webdoctor files, update script, restored, upgraded to latest webos.
Added PAC-ROM 4.4.4, ran great.
Upgraded to 5.1? Ran like crap and then horrible battery drain.
Left it alone for a few days and died all the way.

The fun part:
Wouldn't charge. Tried 5 different USB chargers, all 2A. No sign of life at all.

Start to think back over the steps and realized...I hadn't tried the first charger I used!
Pulled it off my raspberry Pi cause I knew it was a 2Amp.

Plugged in the tablet. INSTANT BUTTON LIGHT!!!
Left overnight. Hard Reset gets me ? battery logo. Still charging and waiting.....

Differences:

Samsung Galaxy USB Charger - 2Amp 5.3V!
Reports online say some put out as much as 5.6. Most agree the battery charge circuit will regulate the excessive voltage down on 95% of devices.

You can find them online for 5$. Someone else try a 5.3v charger and confirm this.

Explains why my Raspberry was running hot as well..