{"product_id":"logitech-mx-master-replacement-battery-37v-450mah-li-polymer","title":"Logitech MX Master 3.7V Li-Polymer Replacement Battery AHB303450","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLogitech MX Master \/ MX Anywhere 2 — 3.7V Li-Polymer Replacement Battery (AHB303450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 450mAh Li-Polymer battery (1.67Wh) that replaces the internal rechargeable cell in the Logitech MX Master and MX Anywhere 2 wireless mice. It matches OEM part numbers AHB303450, 533-000120, 533-000121, 533-000172, 533-000170, 533-000205, and 533-000207. When the original cell degrades and the mouse stops holding charge between sessions, this cell restores normal operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMX Master and MX Anywhere 2 compatibility:\u003c\/strong\u003e\n    Both mice share the same internal battery bay dimensions and connector pinout — 36.84 × 25.20 × 5.60mm with matched voltage and cell chemistry — which is why a single replacement covers both platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge cycles on the MX Master platform and confirmed the BMS accepted full charge without false cutoff, and that charge status reported correctly through the Logitech Options software indicator.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eConnector seating on the MX Master:\u003c\/strong\u003e\n    The JST connector on this cell sits flush only when the locking tab clicks fully. A partially seated connector causes the mouse to report \"no battery\" in Logitech Options even though the cell is physically present — press the connector in until you feel and hear the click before closing the shell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MX Master stops reconnecting after a full battery drain\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the Li-Polymer cell discharges below the BMS cutoff threshold — typically around 2.5V — the protection circuit opens and the mouse loses all power, including the memory that maintains its USB receiver pairing. The receiver itself retains the pairing record, but the mouse needs to re-establish the handshake from its end. After fitting a charged replacement cell, hold the Connect button on the underside for three seconds until the LED blinks, then plug the Unifying receiver into a USB 2.0 port directly — not through a hub — and the pairing restores within a few seconds.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMouse pointer stuttering or skipping before the battery warning appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MX Master's Bluetooth polling rate steps down automatically as cell voltage sags toward end of life, even before the low-battery LED triggers. This causes the pointer to stutter or skip on-screen — users often attribute it to surface or sensor issues first. The voltage sag is a normal end-of-life behaviour in this cell chemistry at 3.7V nominal. If the stutter clears immediately after a full charge cycle, the cell is degraded and replacement is the fix, not a driver update or surface change.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377916280922,"sku":"BWCS-LMX052RC-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377916313690,"sku":"BWCS-LMX052RC-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377916346458,"sku":"BWCS-LMX052RC-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LMX052RC-1.webp?v=1778773964","url":"https:\/\/batteryweb.com\/products\/logitech-mx-master-replacement-battery-37v-450mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}