{"product_id":"shure-mxw1-replacement-battery-37v-850mah-li-ion","title":"Shure SB901 MXW1 Wireless Transmitter Replacement Battery 3.7V 850mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eShure MXW1 \/ MXW6 \/ MXW8 Wireless Transmitters — 3.7V Li-ion Replacement Battery (SB901)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 850mAh (3.15Wh) Li-ion cell replaces the OEM SB901 battery in the Shure MXW1, MXW6, and MXW8 wireless transmitters. These are body-pack and handheld transmitters used in live sound, boardroom, and broadcast applications — not portable speakers. When the original cell degrades, transmit power becomes unstable and audio dropout increases.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMXW1, MXW6, and MXW8 compatibility:\u003c\/strong\u003e\n    All three transmitters run the same 3.7V battery rail with the same SB901 form factor and connector. The BMS handshake is identical across the series, so a single cell covers all three units without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the MXW charging cradle and confirmed BMS communication, charge acceptance, and full-capacity recognition across multiple charge cycles. The transmitter reported correct charge state throughout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCradle charging tip for MXW transmitters:\u003c\/strong\u003e\n    The MXW charging dock cuts off at 4.2V and will not restart a trickle charge on a cell that drops below roughly 2.5V from long-term storage. If a transmitter shows no charge activity after seating in the cradle, allow 15–20 minutes — the BMS may be in recovery mode before the main charge cycle starts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MXW transmitter reports full charge but drops audio mid-performance\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA degraded SB901 cell can pass the cradle's charge check at rest but sag sharply once the RF transmit circuit draws current. The RF stage in the MXW1 pulls a brief current spike on each transmit burst. If internal cell resistance has risen from age or shallow cycling, terminal voltage drops below the transmitter's minimum operating threshold during that spike. The unit cuts audio to protect the RF circuitry, even though the fuel gauge still shows charge remaining. Replacing the cell resets internal resistance to factory levels and eliminates the sag-induced dropout.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMXW transmitter not recognised by charging cradle after extended storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf an MXW transmitter sits unused for several months, the SB901 cell can self-discharge below 2.5V — the minimum voltage the cradle's BMS accepts to begin a standard charge cycle. The cradle LED may blink an error code or show no activity at all. Remove the transmitter, wait 60 seconds, and reseat it firmly — some cradle firmware versions retry the handshake on reinsertion. If the cradle still shows no charge activity after two reseating attempts, the cell is below recovery threshold and replacement is the correct fix.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416232493146,"sku":"BWCS-SGX600SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416232525914,"sku":"BWCS-SGX600SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416232558682,"sku":"BWCS-SGX600SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SGX600SL-1.webp?v=1779761074","url":"https:\/\/batteryweb.com\/products\/shure-mxw1-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}