Issues with power-management

[duckunix]

Hello, all.
Been using this now for a while, and with a few tweeks, it is going great...but for one major issue. Power management sucks. Even using the HP powerbrick, I have to keep the screen below 50%, or it will run out of power.

And, twice now, when it has run flat, I have had to let it sit not plugged in for 24-36 hours, then plug it in, and let it ist 36-72 hours before I see the charging light, and then it takes a while to charge to full.

Any thoughts? I know my old HP Touchpad had issues with the battery dropping down to about 5%, and having to do the same dance to get it back. Maybe just an HP issue? :)