2 block batteries, sealed, rechargeable, extremely low-gassing high rate (lead/calcium in glass fiber fleece technology) OGiV batteries 12 V/12 Ah with a design life of 12 years at 20°C, corresponding to the EUROBAT class: High Performance. Dimensions: 151 x 98 x 95 mm (L/W/H) per unit, weight: 3.4 kg Additional information: The battery pack must not be stored without a battery charge for longer than 2 months after delivery. The battery pack must be connected to the system after 2 months at the latest. If these instructions are not followed, any liability or warranty claims will be rejected.