{"product_id":"ultracell-12v-18ah-rechargeable-vrla-battery-ul18-12","title":"Ultracell 12V 18Ah Rechargeable VRLA Battery - UL18-12","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Ultracell UL18-12 is a 12V 18Ah sealed lead-acid battery in a valve-regulated design, delivering 18Ah capacity at a 20-hour discharge rate. The battery uses absorbed glass mat (AGM) technology, where the electrolyte is held in a fibreglass mat between the plates rather than free-flowing, making it spill-proof and maintenance-free.\u003c\/p\u003e\n\u003cp\u003eDesigned as backup power for fire alarm panels, uninterruptible power supplies, emergency lighting systems and security equipment, the UL18-12 provides standby power when mains supply is interrupted. The battery measures 180mm length by 80mm width by 170mm height and weighs 5.7kg, fitting standard battery compartments in fire alarm control panels including the ESP MAG816. Terminal posts at the top accept M5 or M6 ring terminals for connection to charging circuits and load.\u003c\/p\u003e\n\u003cp\u003eThe VRLA construction means the battery does not require topping up with water during its service life, and the sealed case prevents acid leakage even if the battery is mounted on its side. Constant voltage charging is recommended at 14.4-15.0V for cycle use or 13.6-13.8V for standby applications. The battery carries CE certification and is manufactured to ISO standards, with a typical service life of 3-5 years in float standby applications at 20°C ambient temperature.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Net Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Gross Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e5.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Length (mm)\u003c\/td\u003e\n\u003ctd\u003e180\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width (mm)\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Height (mm)\u003c\/td\u003e\n\u003ctd\u003e170\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_BAT18_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between 18Ah and 20HR capacity?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 18Ah rating is measured at a 20-hour discharge rate (20HR), meaning the battery can deliver 0.9A continuously for 20 hours before reaching its end-of-discharge voltage. Faster discharge rates will yield lower total capacity, while slower rates may yield slightly higher capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat charging voltage should be used?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor standby float charging (fire alarm panels, UPS), use 13.6-13.8V. For cycle use where the battery is regularly discharged and recharged, use 14.4-15.0V. See the specification sheet for detailed charging parameters and temperature compensation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this battery compatible with the ESP MAG816 fire alarm panel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The UL18-12 is the replacement battery for the ESP MAG816 control panel, fitting the battery compartment dimensions and matching the panel's charging circuit specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does the battery last?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn float standby applications at 20°C ambient temperature, the typical service life is 3-5 years. Higher temperatures reduce service life significantly — every 10°C above 20°C approximately halves the expected lifespan. The battery should be replaced when it can no longer deliver the required backup runtime during mains failure testing.\u003c\/p\u003e","brand":"ESP","offers":[{"title":"Default Title","offer_id":45294147109131,"sku":"BAT18","price":49.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/BAT18_8304970e-24a0-4c95-b6c5-a4d61c5b62df.jpg?v=1714668680","url":"https:\/\/niori.co.uk\/products\/ultracell-12v-18ah-rechargeable-vrla-battery-ul18-12","provider":"Niori","version":"1.0","type":"link"}