Baterie UPS 12V/ 8AH Yuasa REW45-12-TW, 6-9 years---https://www.yuasa.co.uk/rew45-12-rew45-12.htmlCapacity at 20-hour Rate (Ah) : 8Capacity Ah (20-HR) : 8Length (mm) : 151Width (mm) : 65Height (mm) : 97.5Weight (kg) : 2.7Nominal Voltage : 12Capacity Ah : 8