Battery drains fast after unbricking KT

I have a Kindle Touch that I have unbricked following the instructions in this forum ( due to freezing at the "Tree" screen ).

However, after this, I have experienced that the battery discharges very fast, sometimes within a day.

I am also unable to get the Kindle to a full charge. It only show 1 bar even though I have charge it overnight. The screen occasionally freezes too and I have to hard reset.

Please advise