VARTA PROMOTIVE BLUE.power that kicks in when reliability is needed.performance that is highly impressive. The innovative Labyrinth lid technology and Acid Reserve Design make VARTA Promotive Blue the robust battery of choice for professionals. Completely maintenance-free and ten times as vibration-resistant as required under European norms.impressive features include Energy Control for everyday situations and the ability to provide maximum power reserves even after prolonged rest periods. This makes VARTA Promotive Blue suitable for a wide range of applications so that it is the premier choice for all construction,municipal,and heavy goods vehicles that need to carry out demanding work.