{"product_id":"jbl-tuner-2-replacement-battery-37v-3350mah-li-ion","title":"JBL Tuner 2 Compatible Battery 3.7V 3350mAh IAA004NA","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Tuner 2 — 3.7V Li-ion Replacement Battery (IAA004NA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3350mAh (12.4Wh) Li-ion replacement battery for the JBL Tuner 2 portable Bluetooth speaker. It replaces OEM part IAA004NA and restores power to the speaker's wireless audio and FM radio functions. Fit the correct part before ordering — the Tuner 2 uses a different cell than the original JBL Tuner.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTuner 2 fitment:\u003c\/strong\u003e\n    The Tuner 2 runs its amplifier, Bluetooth radio, and FM tuner off a single 3.7V cell. JBL uses a BMS that communicates charge state to the onboard fuel gauge — the replacement carries the same cell configuration and connector orientation to maintain that handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Tuner 2 platform and confirmed the BMS accepted charge without triggering a protection cutoff. The fuel gauge reported state-of-charge accurately across the discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge reset after installation:\u003c\/strong\u003e\n    After fitting a new cell, run the speaker down past the low-battery warning tone before recharging fully. The Tuner 2's fuel gauge recalibrates its empty and full thresholds on the first complete cycle — skipping this leaves the indicator reading 10–15% short of actual capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCapacity fade from constant top-off charging on the Tuner 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Tuner 2 is often left on a desk, plugged in whenever it drops below 80%. Li-ion cells stressed by constant high-state-of-charge cycling lose capacity faster than cells that see a fuller discharge range. The cell spends most of its time above 4.0V, which accelerates cathode degradation. Discharge to below 20% at least once a month before recharging to slow this process.\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 current spike that the aged cell can't sustain without voltage sag. When cell voltage dips under load, the amp clips the audio signal before the fuel gauge registers a low state-of-charge. The speaker sounds like it's overdriven, but the indicator may still show two bars. A fresh 3350mAh cell holds voltage under that load — if distortion persists on a new battery, lower volume to rule out the amplifier itself.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416199266394,"sku":"BWCS-JBT210XL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416199299162,"sku":"BWCS-JBT210XL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416199331930,"sku":"BWCS-JBT210XL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JBT210XL-1.webp?v=1779760768","url":"https:\/\/batteryweb.com\/products\/jbl-tuner-2-replacement-battery-37v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}