rtc battery for a527 board

{"cid":"91195620","title":"Sunchip ADW Embedded Advertising AIO Machine 7'' Android Embedded Device RTC Battery","imgUrl":"https:\/\/img.chinax.com\/nimg\/74\/ed\/9b05ef54f05b007300bf30e8d2f1-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"SUNCHIP, ADW","Model Number":"AD-07E AD-08E AD-101E","Minimum Order Quantity":"1 Set","Delivery Time":"Samples: 1-3 days; MP: 25 days;","Place of Origin":"CHINA","Payment Terms":"T\/T, Western Union","Supply Ability":"30,000PCS","Packaging Details":"Carton Box or Wooden Box","CPU\/GPU":"Rockchip PX30 Quad-core Cortex-A35 Mali-G31 MP2 GPU","RAM":"1G\/2G optional (default: 1GB)","ROM":"8GB\/16G\/32G\/64G optional (default: 8GB)","Product Type":"Embedded advertising AIO machine","Display":"LVDS, MIPI","Connection":"WIFI, LAN, BT, 4G Optional","Product Description":"7'' Android Embedded Device","LCD panel size":"7-inch","Resolution":"1280*800","touch panel":"10-Point capacitive touch","OS":"Android 8.1 Version","RTC":"Support RTC battery"}}

{"cid":"91220597","title":"Professional Bimi 10.1\" Android Electronic Cash Register with Drawer and Software","imgUrl":"https:\/\/img.chinax.com\/nimg\/bd\/2b\/605997f7e15facdf7975924e98b7-200x200-1.jpg","attrs":{"Price":"$285.00 - $350.00\/pieces","Brand Name":"Bimi","Minimum Order Quantity":"1 set","After-sales Service Provided":"Video technical support, Online support","CPU":"a83t, A83T (8 cores)","Place of Origin":"Guangdong, China","Product Name":"ECR-0001 Electronic cash regsiter","OS":"Android 4.4.4","Port":"Guangzhou","WIFI":"802.11b \/g\/n Support","Printer and Cash register":"58mm thermal printer and cash register","Main display":"9.7 inch 1024*768 TFT LCD","Customer display":"LCM 128*64 graphic","VAT":"6 VATs","RAM":"1GB DDR3 \/ Flash memory: 8G EMMC","Warranty":"1 Year","Touch Screen Type":"Capacitive Screen","Hard Disk Capacity":"8G","Packaging Details":"1 unit in a color box, 2 units in a carton.","Supply Ability":"1500 Unit\/Units per Month Bimi android electronic cash register"}}