Battery compatible Diamec DM6/3.3 Diameter 6/3.3 6 V3.3ah 6 V 3.4 Ah Agm as 3.2 Ah: Amazon.de: Electronics & Photo
GEM Battery 6V3.3ah Rechargeable Sealed Lead Acid Battery for UPS/ Solar Power Bank /Inverter/Power-Tool/Electric-Scooter - China AGM Battery, VRLA Battery | Made-in-China.com