{"product_id":"harmankardon-esquire-2-replacement-battery-37v-2800mah-li-polymer","title":"CP-HK03 Harman\/Kardon Esquire 2 Compatible Battery 3.7V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHarman\/Kardon Esquire 2 — 3.7V Li-Polymer Replacement Battery (CP-HK03)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2800mAh lithium-polymer cell replaces the original CP-HK03 battery in the Harman\/Kardon Esquire 2 portable Bluetooth speaker. It matches the OEM dimensions at 67.86 × 48.10 × 7.00mm and fits the existing connector and housing without modification. Swap it when the original pack no longer holds a charge or causes audio to cut out before the indicator reads empty.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEsquire 2 fitment:\u003c\/strong\u003e\n    The Esquire 2 uses a flat Li-Polymer pouch cell with a specific footprint and connector pinout tied to its fuel gauge IC. This cell matches those dimensions and connector orientation, so the BMS can read state-of-charge correctly through the same communication line the original used.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through charge and full-discharge cycles on an Esquire 2 unit. The BMS accepted the cell without error flags, the fuel gauge tracked accurately across the range, and the amplifier maintained clean output under combined Bluetooth and high-volume draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly full-discharge cycle for Esquire 2 users:\u003c\/strong\u003e\n    The Esquire 2 spends most of its life on a desk, topped off constantly. Let the speaker play down below 20% at least once a month before plugging it back in — the fuel gauge IC recalibrates on a full cycle, and skipping this accelerates capacity fade on the pouch cell.\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 on the Esquire 2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Esquire 2's Class D amplifier draws sharp current spikes at high volume. When the cell ages and internal resistance rises, those spikes cause voltage sag below the amplifier's clean-operating threshold before the fuel gauge registers critical. The result is audible distortion and clipping while the LED still shows charge remaining. Fitting a fresh cell with lower internal resistance eliminates the sag — confirm the pack is at or above 3.7V resting voltage before the first charge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEsquire 2 not waking from USB when battery is deeply discharged\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the speaker sat unused for several months, the cell may have self-discharged below the USB acceptance threshold — typically around 2.5V for Li-Polymer. The charger controller won't initiate a standard charge handshake below that floor, so the speaker appears completely dead on USB. Connect it to a 5V USB-A source rather than USB-C PD, which can be more forgiving during trickle pre-charge recovery. Leave it connected for 20–30 minutes before attempting to power on; the BMS needs to confirm the cell is above 2.8V before enabling the main charge path.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416219418714,"sku":"BWCS-HKE200SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416219451482,"sku":"BWCS-HKE200SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416219484250,"sku":"BWCS-HKE200SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HKE200SL-1.webp?v=1779760990","url":"https:\/\/batteryweb.com\/products\/harmankardon-esquire-2-replacement-battery-37v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}