The success of Sonnenschein A400 batteries comes from the internationally superior dryfit technology. Exceptional energy storage capacity combined with long life. Maintenance-free (no topping up) during the whole service life due to the Sonnenschein dryfit technology. Nominal capacity 5.5 – 180 Ah C10. 15 years design life at 20°C ambient temperature for blocks 20 Ah and up (80% remaining capacity from C10).