{"product_id":"teufel-rockster-air-2-replacement-battery-128v-10000mah-lifepo4","title":"Teufel ROCKSTER Air 2 Replacement Battery 12.8V 10000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTeufel ROCKSTER Air 2 — 12.8V LiFePO4 Replacement Battery (HYY0953059)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12.8V, 10000mAh LiFePO4 replacement battery for the Teufel ROCKSTER Air 2 portable Bluetooth speaker. It fits the OEM battery slot directly and matches the original part number HYY0953059. Capacity figure is taken from product data at 128Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eROCKSTER Air 2 fit:\u003c\/strong\u003e\n    The ROCKSTER Air 2 runs a 12.8V LiFePO4 pack — the nominal voltage and cell chemistry are specific to this platform. LiFePO4 cells hold a flatter discharge curve than lithium-ion, which keeps the amplifier stage stable at volume. Swapping in a different chemistry or voltage pack risks BMS rejection at the connector handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on the ROCKSTER Air 2 platform. The BMS accepted the pack without fault codes, completed a full charge cycle, and held voltage under sustained high-volume audio draw without triggering thermal cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLiFePO4 cycle care on a portable speaker:\u003c\/strong\u003e\n    LiFePO4 cells are more tolerant of partial charging than lithium-ion, but the ROCKSTER Air 2 fuel gauge can still drift if you never let the pack drop below 40%. Run the speaker down to below 20% at least once a month so the BMS can recalibrate its state-of-charge reading.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on the ROCKSTER Air 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume, the amplifier and Bluetooth radio draw current simultaneously. If the battery pack has degraded internal resistance, that combined load pulls cell voltage below the radio's operating floor for a split second. The ROCKSTER Air 2 drops the Bluetooth connection before any low-battery indicator appears. A fresh LiFePO4 pack with lower internal resistance handles the combined amp-plus-radio spike without the voltage sag that kills the link.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distorting before the battery indicator reads empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when a worn cell can no longer sustain voltage under amplifier load, even though the resting voltage still reads mid-range. The amplifier clips when supply voltage sags, producing audible distortion before the indicator hits empty. It is a cell health symptom, not a speaker fault. Replace the battery and confirm resting voltage sits at or above 13.2V after a full charge — if distortion returns quickly, check the charger output is reaching the correct charge voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416177999962,"sku":"BWCS-TFA200SL-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416178032730,"sku":"BWCS-TFA200SL-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416178065498,"sku":"BWCS-TFA200SL-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TFA200SL-1.webp?v=1779760669","url":"https:\/\/batteryweb.com\/products\/teufel-rockster-air-2-replacement-battery-128v-10000mah-lifepo4","provider":"BatteryWeb","version":"1.0","type":"link"}