{"product_id":"daitem-102-27d-replacement-battery-6v-800mah-li-mno2","title":"Daitem 102-27D Replacement Battery 6V 800mAh BATV29","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDaitem 102-27D — 6V Li-MnO2 Replacement Battery (BATV29)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the BATV29 lithium manganese dioxide cell for the Daitem 102-27D wireless alarm control panel. It runs at 6V with 800mAh capacity. When the original cell depletes, the panel loses its ability to detect and report intruder events.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e102-27D panel compatibility:\u003c\/strong\u003e\n    The 102-27D uses a dedicated BATV29 cell that matches the panel's voltage rail and connector footprint. Swapping to an off-spec cell risks a false low-battery fault or failure to initialise the BMS handshake with the panel logic board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the panel's BMS on the bench. The circuit accepted the cell cleanly, the low-battery flag cleared after the float charge window, and zone polling resumed without manual reset.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation charge window:\u003c\/strong\u003e\n    Do not run a zone diagnostic immediately after fitting this cell. The panel BMS needs 24–48 hours on float charge before it reports an accurate battery state. Running a test too early will trigger a false low-battery alert on the panel display.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 102-27D panel still shows low battery after a fresh cell is fitted\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 102-27D measures battery state through a voltage threshold check, not a direct capacity read. A brand-new Li-MnO2 cell sits at its nominal open-circuit voltage, but the panel BMS requires a sustained float period before it clears the low-battery flag in firmware. This is not a fault with the cell — it is the panel's conditioning logic. Allow 24–48 hours with mains power connected and the flag will clear automatically once the cell voltage stabilises above the panel's acceptance threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm losing stored programming during a mains outage after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the panel drops its zone configuration during a mains outage shortly after a cell replacement, the new battery has not yet been accepted by the panel's backup circuit. The BMS requires a conditioning period — typically 48 hours on mains — before it treats the cell as a valid backup source. During that window, a mains interruption leaves the panel without backup power and it resets to factory state. Keep mains connected for a full 48 hours after installation before testing backup operation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43309809434714,"sku":"BWCS-BCT290BT-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43309809467482,"sku":"BWCS-BCT290BT-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43309809500250,"sku":"BWCS-BCT290BT-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BCT290BT-1.webp?v=1777868106","url":"https:\/\/batteryweb.com\/products\/daitem-102-27d-replacement-battery-6v-800mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}