{"product_id":"samsung-mx-st50bxy-replacement-battery-74v-9800mah-li-ion","title":"Samsung MX-ST50B\/XY Compatible Battery 7.4V 9800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung MX-ST50B\/XY Sound Tower — 7.4V Li-ion Replacement Battery (AH81-15614A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 9800mAh Li-ion battery replaces the original pack in the Samsung MX-ST50B\/XY Sound Tower portable speaker. It slots into the same bay as the OEM unit and connects through the same BMS handshake the speaker firmware expects. Capacity is rated at 72.52Wh — matching the original spec for full wireless playback sessions.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMX-ST50B\/XY Sound Tower fit:\u003c\/strong\u003e\n    This speaker runs the amplifier, Bluetooth radio, and DSP processor from a single 7.4V cell pack. The BMS in this replacement communicates the correct state-of-charge data back to the speaker's fuel gauge IC, so the onscreen battery indicator reads accurately from day one.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through charge and discharge cycles on the MX-ST50B, monitoring cell voltage under combined amplifier and Bluetooth radio load. The BMS held protection thresholds correctly and did not trip on normal high-volume draw spikes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge maintenance for daily use:\u003c\/strong\u003e\n    If this speaker lives on your desk and you top it off before it drops below 50%, do a full discharge below 20% at least once a month before recharging. Constant shallow cycling causes the fuel gauge IC to drift, making the battery indicator unreliable and accelerating capacity fade on the Li-ion cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Sound Tower shows full charge but audio cuts out after an hour\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC loses calibration after months of shallow charging. The indicator reads 80–100% but the actual cell voltage is lower than reported. When the amplifier pulls current for a bass-heavy track, the cell voltage sags below the BMS protection floor and the speaker shuts down or mutes. Replacing the battery resets the baseline, but you need one full discharge-to-20% and recharge cycle immediately after installation to calibrate the new pack's gauge correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier draws a surge of current that drags cell voltage down faster than the fuel gauge tracks. When the cell sags below roughly 6.8V under load, the amplifier starts clipping — you hear distortion or crackling before the indicator shows low battery. This is not a speaker fault; it is voltage sag on a degraded cell under peak draw. A new 9800mAh pack at full charge holds voltage above that threshold across normal listening levels, eliminating the premature clipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416178294874,"sku":"BWCS-SMT240SL-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178327642,"sku":"BWCS-SMT240SL-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178360410,"sku":"BWCS-SMT240SL-3","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMT240SL-1.webp?v=1779760649","url":"https:\/\/batteryweb.com\/products\/samsung-mx-st50bxy-replacement-battery-74v-9800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}