Baterie UPS 12V/ 17AH Yuasa NP17-12I -TW, 3-5 years---https://www.yuasa.co.uk/batteries/industrial-view-all/np17-12i.htmlCapacity at 20-hour Rate (Ah) : 17Capacity Ah (20-HR) : 17Length (mm) : 181Width (mm) : 76Height (mm) : 167Total Height (mm) : 167Weight (kg) : 6.1Nominal Voltage : 12Capacity Ah : 17