Sonnak's EndurancePRO range evolves: the “made for severe cycling” battery range features the innovative HVR® (High Vibration Resistance) design, that assures an incomparable level of robustness and minimized risk of unexpected and premature battery failure. Not only it guarantees excellent cycling performances and reduced stratification: the new EndurancePRO EFB battery now exceeds the highest requirements in the industry’s reference vibration test (V4 level in EN50342-1 vibration test) and it is perfectly adapted to be installed into vehicles running on rough terrain.