Go to tweak T -> choose 3 -> choose -> 1 -> choose 2 -> choose 1 -> when it ask you about password "ROOT" - write: rootme and wait until it done.
After this try again:
Go to tweak T -> choose 3 -> choose 1 -> choose 1 -> choose 0 -> when it ask you about password "ROOT" - write: rootme and wait until it done -> when it ask you to return, press R -> choose 1 -> and choose 6 from menu for activating battery percentage -> press enter for exit.