{"product_id":"astralite-20-0001-replacement-battery-48v-2000mah-ni-mh","title":"Astralite 20-0001 Emergency Light Replacement Battery 4.8V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAstralite 20-0001 — 4.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V 2000mAh Ni-MH replacement battery for the Astralite 20-0001 emergency lighting unit. It slots into the fitting to restore backup illumination during mains failure events. Voltage and capacity match the original cell pack exactly — 4.8V, 2000mAh (9.6Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAstralite 20-0001 fitting:\u003c\/strong\u003e\n    The 20-0001 uses a 4.8V Ni-MH cell pack with a fixed connector orientation and charge controller tuned for Ni-MH float voltage. Swapping to any other chemistry or voltage trips the charge circuit and flags a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge cycle and a simulated mains-dropout test. The BMS accepted charge without fault, and the cell held voltage under load through the complete test window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle test requirement:\u003c\/strong\u003e\n    Within 24 hours of installation, hold the test button for the full rated duration. This allows the charge controller to register the new cell capacity and confirm the pack accepts load before your next scheduled compliance inspection.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEmergency light failing its duration test after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Ni-MH cell ships in a partially discharged state. The charge controller in the 20-0001 fitting begins trickle charging on installation, but the cell needs at least one full charge cycle before it reaches rated capacity. Running a duration test too early — before the cell is fully conditioned — produces a short-duration result that looks like a faulty battery. Allow 24 hours on charge after installation, then run the test. The cell should hold voltage above 4.0V at the end of the duration window.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator staying red after new battery installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome Astralite fittings lock the fault LED on when the cell voltage at installation falls outside the charge controller's float acceptance window. A cell that has been in storage for several months may read low enough to trigger this. Leave the fitting on mains power for 12–24 hours — the controller will bring the cell up through its bulk charge phase and clear the fault automatically. If the red LED persists past 24 hours, check that the connector is fully seated and the cell terminal voltage reads at least 4.4V with a multimeter.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360422592602,"sku":"BWCS-EMC150LS-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360422625370,"sku":"BWCS-EMC150LS-2","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360422658138,"sku":"BWCS-EMC150LS-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EMC150LS-1.webp?v=1778614638","url":"https:\/\/batteryweb.com\/products\/astralite-20-0001-replacement-battery-48v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}