... circuit prevents the box from over-recharging or over-discharging. Under the monitor of our computer, the quality can be assured.specification ... temperature ,1C cycle to 60%,100%DOD)Picture showAbout us: CHINA E ERA CO., LTD was established in 2008 in Shenzhen ... , OEM is welcome. if you are interested, welcome to inquiry from us. 12v 18000mah Ups Battery with high quality