{"product_id":"diagral-transmission-diag55aax-replacement-battery-37v-1500mah-li-ion","title":"Diagral DIAG55AAX Transmission Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDiagral Transmission DIAG55AAX — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1500mAh lithium-ion cell replaces the internal battery in the Diagral Transmission DIAG55AAX wireless alarm transmitter. The transmitter handles radio frequency communication between your alarm sensors and the main control panel. When this cell depletes, that RF link drops and the panel loses sensor data.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDIAG55AAX transmitter fit:\u003c\/strong\u003e\n    The DIAG55AAX uses a single 3.7V lithium-ion cell to power its RF transmission module. The BMS inside the transmitter monitors cell voltage and cuts the radio link when voltage drops below threshold — a fresh 1500mAh cell at the correct voltage restores that link without requiring panel reprogramming.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the bench. The BMS accepted the cell cleanly, voltage stabilised at 3.7V nominal, and the protection circuit responded correctly to simulated over-discharge conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation float period:\u003c\/strong\u003e\n    Do not run a zone diagnostic test immediately after swapping this cell. Allow 24 to 48 hours on float charge first. Running a test too early can trigger a false low-battery report from the panel before the cell reaches full charge acceptance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DIAG55AAX panel reports low battery hours after a new cell is fitted\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Diagral alarm panel samples the transmitter's cell voltage at regular intervals and compares it against a stored threshold. A freshly installed cell that hasn't completed its first full charge cycle may sit just below that threshold, even if the cell itself is not defective. The panel's BMS needs 24 to 48 hours of float charge before it updates its battery status register. If the low-battery indicator clears within that window, the cell and the transmitter are functioning correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm panel losing sensor communication after transmitter battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the DIAG55AAX's battery cuts power to the RF module, which can cause the transmitter to drop its pairing with the main panel. This is not a fault with the replacement cell — it is a power-interruption response in the transmitter's firmware. After fitting the new cell, re-trigger the zone pairing sequence from the panel menu. Confirm the sensor link is restored by checking the panel's zone status screen — each paired sensor should show active at its assigned zone number.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43309820706906,"sku":"BWCS-DRX300BT-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43309820739674,"sku":"BWCS-DRX300BT-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43309820772442,"sku":"BWCS-DRX300BT-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DRX300BT-1.webp?v=1777868106","url":"https:\/\/batteryweb.com\/products\/diagral-transmission-diag55aax-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}