The struggling German battery manufacturer Varta is once again appealing for help from its investors as a crisis at the business continues to deepen. Varta has been battered by a slump in demand, competition from cheaper Asian competitors and a cyber attack, all of which have complicated efforts to restructure the company. A proposed restructuring plan put forward last summer is “no longer adequate” to return Varta to profitable growth by the end of 2026 as previously planned, the company announced late on Thursday. Varta’s management board is negotiating a solution with creditors and investor…