{"product_id":"audio-technica-ath-ar5bt-replacement-battery-37v-700mah-li-polymer","title":"Audio-Technica ATH-AR5BT Replacement Battery 3.7V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAudio-Technica ATH-AR5BT — 3.7V Li-Polymer Replacement Battery (KPL603038)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 700mAh lithium-polymer cell replaces the original KPL603038 battery inside the Audio-Technica ATH-AR5BT wireless headphones. It fits the ATH-AR5BT directly, restoring Bluetooth audio and wireless playback to full capacity. Dimensions are 40.10 × 29.60 × 6.00mm — verify against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eATH-AR5BT fitment:\u003c\/strong\u003e\n    The ATH-AR5BT uses a slim Li-Polymer pouch cell with a specific connector orientation and BMS profile matched to the headphone's charging circuit. A mismatched cell voltage or connector pinout will prevent the headphones from powering on — this replacement matches the original on both counts.\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 ATH-AR5BT platform. The BMS accepted the new pack without fault codes, and the protection circuit responded correctly to both overvoltage cutoff and low-voltage shutdown thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for the ATH-AR5BT:\u003c\/strong\u003e\n    Charge the headphones to full via USB before the first use. The ATH-AR5BT's onboard circuit needs a complete initial charge cycle to calibrate the battery gauge — skipping this step causes the charge indicator to read inaccurately for the first several uses.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ATH-AR5BT cuts out mid-playback after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ATH-AR5BT draws current from two simultaneous loads: the Bluetooth radio and the audio amplifier stage. Under that combined draw, a new cell sitting near storage voltage — typically around 3.6V — can sag below the BMS cutoff threshold and trigger a shutdown. This is not a fault with the replacement cell. A full charge cycle before first use brings the cell to 4.2V and gives the BMS enough headroom to handle peak draw without tripping.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator shows full but headphones cut off after short use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom happens when a replacement cell is installed at storage voltage and the headphone's fuel gauge has not recalibrated to the new cell. The gauge reports 100% based on stale data, but the cell has not completed a full charge cycle. Run one complete charge from flat to full — confirmed by the charge LED extinguishing — then discharge through normal use. After two to three of these full cycles, the gauge reading and actual capacity align reliably. Target a resting voltage of 4.15–4.20V after a completed charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428105453658,"sku":"BWCS-ATH500SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428105486426,"sku":"BWCS-ATH500SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428105519194,"sku":"BWCS-ATH500SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ATH500SL-1.webp?v=1779934116","url":"https:\/\/batteryweb.com\/products\/audio-technica-ath-ar5bt-replacement-battery-37v-700mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}