{"product_id":"arts-sd-s3-nt-u-c75-replacement-battery-36v-4000mah-ni-cd","title":"Arts 803169 Emergency Light Replacement Battery 3.6V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eArts SD S3 NT U C75 — 3.6V Ni-Cd Replacement Battery (803169)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 4000mAh Ni-Cd replacement battery for Arts SD S3 NT U C75 emergency lighting units. It slots directly into the fitting and restores the backup power that activates when mains power fails. OEM part number 803169 matches the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD S3 NT U C75 compatibility:\u003c\/strong\u003e\n    These units share the same 3.6V charge rail, connector footprint, and trickle charge controller logic. Swapping to this cell keeps the charge controller operating within its designed float voltage window without triggering a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle and then applied a load test. The cell accepted charge cleanly, the BMS registered capacity correctly, and the protection circuit responded to over-discharge cutoff at the expected threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning on emergency lighting fittings:\u003c\/strong\u003e\n    Run a full manual test within 24 hours of installation — hold the test button for the complete rated duration. This allows the charge controller to register the new cell's capacity 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\"\u003eCharge indicator staying red after installing the new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eArts emergency lighting charge controllers use a float acceptance window to confirm a valid cell is connected. A new Ni-Cd cell shipped from storage can sit below the float threshold voltage, which causes the controller to flag a fault rather than enter charge mode. This is not a faulty battery — it is a voltage mismatch from storage self-discharge. Leave the fitting powered for 12–24 hours; once the cell voltage climbs into the acceptance window, the indicator should shift to green.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEmergency light dims partway through a duration test\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Ni-Cd cell that has not been through a full conditioning cycle has not yet reached its rated 4000mAh capacity. During a duration test, the cell runs out of usable charge earlier than expected and the light output drops. This is not a wiring fault or a defective cell. Run one complete charge-then-discharge cycle via the test button before submitting the unit for a formal compliance test — after that cycle, the cell delivers its full rated capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360405651546,"sku":"BWCS-ERC960LS-1","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360405684314,"sku":"BWCS-ERC960LS-2","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360405717082,"sku":"BWCS-ERC960LS-3","price":71.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERC960LS-1.webp?v=1778614597","url":"https:\/\/batteryweb.com\/products\/arts-sd-s3-nt-u-c75-replacement-battery-36v-4000mah-ni-cd","provider":"BatteryWeb","version":"1.0","type":"link"}