{"product_id":"besam-automatische-turoffnung-emc-replacement-battery-24v-300mah-ni-mh","title":"24V Besam 505186-BB Automatic Door Lock Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBesam automatische Turoffnung EMC Series — 24V Ni-MH Replacement Battery (505186-BB)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 24V 300mAh Ni-MH replacement battery for Besam automatic door opening systems. It fits the automatische Turoffnung EMC, EMCM, EU-EUD, and related EMC-series operators. The battery backs up the electronic door lock mechanism so the door operator can function during a power interruption.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEMC and EMCM series compatibility:\u003c\/strong\u003e\n    These models share the same 24V battery bay, connector pinout, and BMS handshake protocol. The 505186-BB also cross-references as OEM part numbers 654699, 41A017CA00001, and 06000142 — all drawing from the same 24V Ni-MH cell stack.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge, standby, and simulated power-fail events on an EMC-series operator. The BMS accepted the cell stack without fault codes, held float charge correctly, and released cleanly on simulated mains dropout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap access method verification:\u003c\/strong\u003e\n    After fitting this battery, cycle power to the door operator completely before closing the door. Some EMC-series units require a full controller reboot to re-establish the BMS handshake — skipping this step can leave the lock unresponsive to access credentials until the reboot completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EMC operator shows a fault LED immediately after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells ship in a partial state of charge, typically between 40–60% of rated capacity. The EMC controller measures open-circuit voltage on startup and flags a fault if the reading falls below its internal threshold, even with a brand-new battery installed. This is a controller-side check, not a battery defect. Run a full charge cycle via the operator's onboard charger before placing the door back into service — the fault LED will clear once the pack reaches approximately 26–27V under charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDoor operator not responding to access credentials after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery cuts power to the controller board, which clears its working state. On EMC-series units, the firmware must complete an initialisation sequence before the access control logic goes live again. If credentials are tested before that sequence finishes, the lock will not respond — this is not a wiring fault or a battery issue. Remove the battery, wait 10 seconds, refit it, allow the operator 30 seconds to boot fully, then test access at 24V steady-state on the battery terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360218873946,"sku":"BWCS-BUS186SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360218906714,"sku":"BWCS-BUS186SL-2","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360218939482,"sku":"BWCS-BUS186SL-3","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BUS186SL-1.webp?v=1778610981","url":"https:\/\/batteryweb.com\/products\/besam-automatische-turoffnung-emc-replacement-battery-24v-300mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}