{"product_id":"poly-sy20-usb-a-replacement-battery-37v-3350mah-li-ion","title":"Poly SY20 USB-A Replacement Battery 3.7V 3350mAh A0697","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePoly SY20 USB-A — 3.7V Li-ion Replacement Battery (A0697)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 3350mAh (12.4Wh) Li-ion battery replaces the A0697 cell in the Poly SY20 USB-A portable speaker. It restores wireless audio playback after the original cell degrades or fails. Dimensions are 66.00 × 21.70 × 20.00mm — confirm before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSY20 USB-A cell match:\u003c\/strong\u003e\n    The SY20 USB-A runs a single-cell 3.7V nominal Li-ion pack. The A0697 cell connects directly to the speaker's charge management IC and audio amplifier rail — voltage tolerance is tight, so cell chemistry and nominal voltage must match exactly.\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 a SY20-class load. The BMS held charge termination at 4.2V and cut off discharge at the expected low-voltage threshold without tripping prematurely under amplifier draw spikes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for SY20 users:\u003c\/strong\u003e\n    The SY20 sits on desks and gets topped off constantly. Run the speaker down below 20% at least once a month before recharging — shallow cycling without a full discharge causes fuel gauge drift, and the charge indicator stops reflecting actual cell capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\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\"\u003eAs the Li-ion cell discharges toward 3.5V, the amplifier rail sags before the low-battery indicator triggers. The amplifier clips under that reduced voltage, producing distortion even though the SY20 still shows battery remaining. This is a voltage sag issue, not a speaker fault. If distortion appears consistently in the final quarter of a charge cycle, the cell has lost capacity — replace it when resting voltage drops below 3.6V after a full charge.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSY20 not waking from USB when battery is deeply discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf a deeply discharged SY20 shows no response when plugged into USB, the cell has likely dropped below the minimum acceptance voltage for the charge IC — typically under 2.5V. At that level, the charge management circuit enters a protection state and will not pass current to the speaker. Plug into a USB port delivering at least 5V 500mA and leave it for 15–20 minutes without pressing any buttons — the IC runs a trickle pre-charge to recover the cell before switching to normal charge mode. If the indicator light never appears after 30 minutes, check the USB cable and port output voltage first.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416194973786,"sku":"BWCS-PRY200XL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416195006554,"sku":"BWCS-PRY200XL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416195039322,"sku":"BWCS-PRY200XL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PRY200XL-1.webp?v=1779760792","url":"https:\/\/batteryweb.com\/products\/poly-sy20-usb-a-replacement-battery-37v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}