Baterie UPS 12V/ 4AH Yuasa NP4-12-TW, 3-5 Yeras---https://www.yuasa.co.uk/np4-12.htmlCapacity at 20-hour Rate (Ah) : 4Capacity Ah (20-HR) : 4Length (mm) : 90Width (mm) : 70Height (mm) : 106Total Height (mm) : 106Weight (kg) : 1.75Nominal Voltage : 12Capacity Ah : 4