{"product_id":"philips-tah9505bk-replacement-battery-37v-900mah-li-polymer","title":"Philips TAH9505BK Compatible Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips TAH9505BK — 3.7V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 900mAh Li-Polymer cell replaces the internal battery in the Philips TAH9505BK noise-cancelling wireless headphones. It restores charge capacity when the original cell has degraded from repeated shallow cycling. Capacity is 900mAh (3.33Wh) — identical to the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTAH9505BK fit:\u003c\/strong\u003e\n    The TAH9505BK runs a single Li-Polymer cell at 3.7V nominal. This replacement matches the cell dimensions (39.50 × 33.60 × 6.70mm), voltage rail, and connector orientation, so the BMS accepts the new cell without throwing a charge fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the TAH9505BK's charge circuit and confirmed the BMS completed a full charge handshake without error. The protection circuit tripped correctly at low-voltage cutoff — no false shutdowns under combined Bluetooth and audio draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the TAH9505BK:\u003c\/strong\u003e\n    Seat the headset in its charging cradle and let it complete one uninterrupted full charge before use. The TAH9505BK's battery gauge resets its talk-time estimate during this cycle — skipping it means the indicator will 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 TAH9505BK cuts out mid-call even with charge showing\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TAH9505BK draws simultaneously from its audio amplifier and Bluetooth radio during a call. That combined load pulls more current than passive listening, which causes a momentary voltage sag on a degraded or newly installed cell. If the cell voltage dips below the BMS cutoff threshold — typically around 3.0V under load — the headset shuts off even though the resting charge level looked fine. A new cell at full charge resolves the sag. After a full first cycle, the protection circuit holds stable under combined draw.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows full charge but headset cuts off after short use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA replacement cell ships at storage voltage — usually between 3.6V and 3.8V — not at a full 4.2V. The TAH9505BK base station can misread this as a complete charge and stop topping up the cell. The result is a headset that appears fully charged but carries only partial capacity. Place the headset in the cradle, wait for the charge indicator to cycle through a complete charge sequence from scratch, and verify the cell reaches 4.2V before first use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428105322586,"sku":"BWCS-PHA950SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428105355354,"sku":"BWCS-PHA950SL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428105388122,"sku":"BWCS-PHA950SL-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PHA950SL-1.webp?v=1779934117","url":"https:\/\/batteryweb.com\/products\/philips-tah9505bk-replacement-battery-37v-900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}