{"product_id":"criticalresponse-m1501-replacement-battery-37v-1050mah-li-ion","title":"CriticalResponse M1501 Pager Replacement Battery 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCriticalResponse M1501 \/ REH-1501 — 3.7V Li-ion Replacement Battery (CS523450AL 1S1P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1050mAh Li-ion cell for the CriticalResponse M1501 and REH-1501 pagers. It matches the OEM part number CS523450AL 1S1P and fits the same physical footprint at 53.40 × 38.00 × 7.50mm. These pagers are used in healthcare, emergency services, and industrial environments where alert delivery cannot be interrupted.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM1501 and REH-1501 compatibility:\u003c\/strong\u003e\n    Both models use the same single-cell Li-ion holder, voltage rail, and contact arrangement. One cell covers both — no wiring or adapter needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge acceptance and BMS handshake verification. The protection circuit responded correctly to both low-voltage cutoff and over-charge thresholds at 3.7V nominal.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap power cycle:\u003c\/strong\u003e\n    After fitting the new cell, power the pager fully off and back on. Some M1501 units require a fresh boot to re-register on the paging network and reset the low-battery indicator to the new voltage baseline.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the M1501 drains faster during high-traffic alert periods\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M1501 draws more current when it receives frequent pages or when the signal from the local transmitter is weak and the receiver has to work harder. A 1050mAh cell at 3.7V has a fixed energy budget of 3.89Wh. Heavy alert traffic and extended signal-search cycles both pull from that budget faster than light-use standby. If your environment has changed — new building, relocated transmitter, increased message volume — expect shorter intervals between charges.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLow battery warning appears immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCells ship at storage voltage, typically around 3.6–3.65V, which sits below the M1501's low-battery threshold. The pager sees this and flags the warning before the cell has been used at all. Charge the pager normally for a full cycle — once the cell reaches its working voltage range above 3.7V, the indicator clears. No fault with the cell or the device.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410890883162,"sku":"BWCS-CRM501PR-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410890915930,"sku":"BWCS-CRM501PR-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410890948698,"sku":"BWCS-CRM501PR-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CRM501PR-1.webp?v=1779581571","url":"https:\/\/batteryweb.com\/products\/criticalresponse-m1501-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}