rukh fake dead battery

According to the specs Sampa had shown him, Rukh's vaunted personal invisibility cloak was supposed to last for three full minutes. In actuality - Kimmund made a point of timing it - the thing popped him back out after two minutes and twenty seconds.
[...]
Even before the hatch was all the way open the two prone gunners' weapons inexplicably jerked to either side, one left, one right, their blasts arcing harmlessly into the corridor walls instead of their targets. A split second later the two kneeling Grysks' heads simultaneously snapped backward, the backs of their helmets slamming into the torsos of the soldiers standing behind them, all four blasts also going wildly off target as their lightning guns were knocked out of line.
[...]
And then, to Kimmund's complete lack of surprise, Rukh popped back into sight, his electrostaff still pressed against the last Grysk's throat.
[...]
"I thought your gadget was out of juice," he said as he stepped over the alien bodies and strode toward the children.
"That was what I wanted you to think," Rukh said, falling into step beside him. Kimmund sniffed, a whiff of burning skin making its way through his air system. Apparently, despite his attempt to keep the Noghri clear of the shooting by ordering head shots from his soldiers, Rukh had caught the edge of one of the blaster bolts. "As I likewise wanted any Grysks monitoring our progress to assume."

Thrawn: Alliances, Ch. 20, pg. 316-320