{"product_id":"audio-technica-at-sb727-replacement-battery-37v-2600mah-li-ion","title":"Audio-Technica LI-210 Portable Speaker Compatible Battery 3.7V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAudio-Technica AT-SB727 Sound Burger — 3.7V Li-ion Replacement Battery (LI-210)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe LI-210 is a 3.7V, 2600mAh Li-ion cell that powers the Audio-Technica AT-SB727 Sound Burger portable turntable speaker. It replaces the original pack when the unit no longer holds a charge or cuts out during playback. Dimensions are 65.70 × 21.50 × 18.30mm — confirm these against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAT-SB727 and AUATSB727 compatibility:\u003c\/strong\u003e\n    Both model designations use the same LI-210 pack. The voltage rail, connector pinout, and BMS handshake are identical across the AT-SB727 and AUATSB727 variants, so one cell fits both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the LI-210 through charge and discharge on the AT-SB727 platform. The BMS held protection thresholds correctly — no false overcurrent trips, no undervoltage cutoff at idle draw, and charge termination landed at the expected 4.2V cell ceiling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly discharge cycle for the AT-SB727:\u003c\/strong\u003e\n    This unit gets left on a desk and topped off constantly. That shallow cycling causes fuel gauge drift — the indicator reads full while actual capacity is 60% or less. Run the speaker down below 20% at least once a month before recharging to reset the fuel gauge and slow capacity fade on the Li-ion cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBluetooth dropping at high volume on a new LI-210\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt high volume the AT-SB727 amplifier draws a spike of current on top of the constant Bluetooth radio draw. If the cell has any internal resistance — even on a new pack that was shipped in partial-charge state — the combined load causes a momentary voltage sag. The BMS reads that sag as an undervoltage event and briefly cuts the radio before the amp recovers. Charge the LI-210 fully to 4.2V before first use; that sag window narrows significantly on a fully conditioned cell.\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\"\u003eThe AT-SB727 amplifier begins clipping when cell voltage drops below roughly 3.5V, even though the indicator may still show one or two bars. The battery gauge uses a voltage-to-capacity curve that can drift after months of shallow cycling, so the display lags behind real cell state. You hear the distortion first — it is not a speaker fault. Swap in a charged LI-210 and confirm voltage at the cell terminals reads 3.7V or above before ruling out the amplifier.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416179867738,"sku":"BWCS-ASB727SL-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416179900506,"sku":"BWCS-ASB727SL-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416179933274,"sku":"BWCS-ASB727SL-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ASB727SL-1.webp?v=1779760586","url":"https:\/\/batteryweb.com\/products\/audio-technica-at-sb727-replacement-battery-37v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}