{"product_id":"logitech-ue-megaboom-replacement-battery-74v-3400mah-li-ion","title":"Logitech UE MegaBoom 7.4V Compatible Battery 533-000116","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLogitech UE MegaBoom — 7.4V Li-ion Replacement Battery (533-000116)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 3400mAh Li-ion battery replaces the original pack in the Logitech UE MegaBoom portable Bluetooth speaker (S-00147). It fits both OEM part numbers 533-000116 and 533-000138. Capacity is rated at 25.16Wh, matching the original cell spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUE MegaBoom and S-00147 compatibility:\u003c\/strong\u003e\n    Both the UE MegaBoom and S-00147 variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this pack covers both 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 full charge and discharge cycles on a UE MegaBoom unit. The BMS accepted the pack without error flags, and the fuel gauge tracked state-of-charge accurately across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle — UE MegaBoom specific:\u003c\/strong\u003e\n    The MegaBoom's always-on Bluetooth standby drains the cell slowly even when not playing audio. Let the pack drop below 20% at least once a month before recharging — constant top-off charging without a full discharge causes fuel gauge drift on this model and accelerates capacity fade.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the UE MegaBoom shows full charge but audio cuts out after an hour\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the MegaBoom calibrates its charge estimate against the battery's internal resistance. When the original cell ages, resistance rises and the gauge loses accuracy — it reports 100% based on a baseline that no longer matches the actual cell capacity. The result is a full-charge indicator that collapses within an hour of real audio draw. Replacing the cell resets the baseline, but the gauge needs one full discharge-to-shutdown and recharge cycle to recalibrate to the new pack.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting at high volume before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the MegaBoom's amplifier pulls a sharp current spike that causes momentary voltage sag on a degraded or deeply discharged pack. The amplifier clips under that sag, producing audible distortion before the battery LED has signalled low charge. This is a voltage delivery problem, not an audio hardware fault. A fresh cell with lower internal resistance holds the voltage rail stable under amplifier load — charge the new pack fully before the first high-volume session to confirm the distortion clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416232689754,"sku":"BWCS-LOE116XL-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416232722522,"sku":"BWCS-LOE116XL-2","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416232755290,"sku":"BWCS-LOE116XL-3","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LOE116XL-1.webp?v=1779761043","url":"https:\/\/batteryweb.com\/products\/logitech-ue-megaboom-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}