{"product_id":"turtle-beach-ear-force-replacement-battery-37v-900mah-li-polymer","title":"Turtle Beach Ear Force Stealth 400 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTurtle Beach Ear Force Stealth 400 \/ 520 Series — 3.7V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 900mAh (3.33Wh) lithium-polymer cell replaces the internal battery in the Turtle Beach Ear Force, Ear Force Stealth 400, Stealth 500, and Stealth 520 wireless gaming headsets. The original cell degrades after repeated charge cycles, causing shortened use time or failure to hold charge. Swapping this cell restores full wireless audio function without replacing the entire headset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStealth 400, 500, and 520 compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V battery rail, connector footprint, and BMS handshake protocol. The cell dimensions — 48.70 x 30.80 x 5.90mm — match the internal cavity across the range, and the BMS voltage thresholds align with the headset's charge controller.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the Stealth 400 charge controller and confirmed the BMS completed its handshake with the base station. Charge termination triggered correctly at 4.2V, and the protection circuit responded to overdischarge cutoff as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after installation:\u003c\/strong\u003e\n    Seat the headset in the base station and run a full uninterrupted charge cycle before using it. The base station needs to log the new cell before the charge indicator gives an accurate reading — pulling it off the cradle early will cause the headset to report incorrect charge status.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station showing charging error after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Stealth series base station communicates with the headset's BMS before it begins a charge cycle. If the BMS hasn't completed its initialisation handshake — which happens on the first full charge — the base may flag an error or show no charge activity at all. This is not a fault with the cell. Seat the headset firmly in the cradle, wait for the charge LED to settle, and leave it undisturbed through the full first cycle. A solid charge indicator after that cycle confirms the handshake completed correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHeadset cutting out mid-session on a fresh battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Stealth headsets draw from the battery across two simultaneous loads — the wireless radio and the audio processing circuit. Under combined draw, a cell sitting near its low-voltage threshold can sag below the BMS cutoff point and trigger a shutdown even when the charge indicator still shows remaining capacity. If cutouts happen early in a session, the cell likely shipped at storage voltage around 3.7–3.8V. Run one full charge cycle first. If cutouts continue after a full charge, reseat the connector and confirm contact is flush — an intermittent connection will cause the same symptom under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428105027674,"sku":"BWCS-STH400SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428105060442,"sku":"BWCS-STH400SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428105093210,"sku":"BWCS-STH400SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-STH400SL-1.webp?v=1779934246","url":"https:\/\/batteryweb.com\/products\/turtle-beach-ear-force-replacement-battery-37v-900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}