{"product_id":"ajax-hub-replacement-battery-37v-2100mah-li-polymer","title":"Ajax Hub XK953562 Replacement Battery 3.7V 2100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAjax Hub Series — 3.7V Li-Polymer Replacement Battery (XK953562)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2100mAh Li-Polymer cell that replaces the internal backup battery in Ajax Hub, Hub 2, Hub 2 Plus, and AJ-HUB-W\/B control panels. The Hub is the central processor of Ajax alarm systems — it manages all wireless sensor communication and maintains alarm state during mains power outages. When the original cell degrades, backup power drops and the panel begins reporting low battery warnings.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHub and Hub 2 series compatibility:\u003c\/strong\u003e\n    All four panel variants share the same 3.7V Li-Polymer cell, connector pinout, and BMS handshake protocol. The XK953562 part number covers the full range without any hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in a Hub 2 Plus on the bench. The BMS accepted the cell immediately, entered float charge within the expected window, and cleared the low-battery flag after the conditioning period completed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install zone testing:\u003c\/strong\u003e\n    Do not run a zone diagnostic immediately after fitting this cell. The panel BMS requires 24–48 hours at float charge before it reports an accurate battery state. Running a test before that window closes will trigger a false low-battery alert in the Ajax app.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm panel showing low battery hours after installing a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAjax panels do not read battery state from raw voltage alone — the BMS monitors charge acceptance over a conditioning window before updating the reported status. A freshly installed cell will often sit at or near 3.7V but the panel still flags low battery because the conditioning cycle has not completed. This is not a fault with the cell. Leave the panel on mains power for 48 hours, then check the Ajax app — the alert will clear once float charge is confirmed.\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 configuration during a power cut shortly after a battery replacement, the new cell had not yet been accepted by the BMS as a valid backup source. The panel treats an unconfirmed cell as absent and cannot sustain memory or communication. Re-seat the battery, restore mains power, and allow a full 48-hour charge cycle before testing backup operation. After that window, the BMS will hold the cell in reserve and programming will survive outages normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43309804748890,"sku":"BWCS-AHB200BT-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43309804781658,"sku":"BWCS-AHB200BT-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43309804814426,"sku":"BWCS-AHB200BT-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AHB200BT-1.webp?v=1777868134","url":"https:\/\/batteryweb.com\/products\/ajax-hub-replacement-battery-37v-2100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}