{"product_id":"sennheiser-ek2020-replacement-battery-37v-1500mah-li-polymer","title":"Sennheiser EK2020 Receiver Compatible Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSennheiser EK2020 \/ EK 2020-D-II Receiver — 3.7V Li-Polymer Replacement Battery (543604)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1500mAh Li-Polymer cell replaces the internal battery in the Sennheiser EK2020 and EK 2020-D-II wireless receiver units. It matches OEM part numbers 543604 and 19082102-1. Dimensions are 67.00 × 39.20 × 4.20mm — the flat profile fits the receiver's slim chassis without modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEK2020 and EK 2020-D-II compatibility:\u003c\/strong\u003e\n    Both receiver variants share the same battery bay geometry, connector pinout, and 3.7V supply rail. The BMS handshake is identical across the two, so one cell covers both units.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the EK2020 receiver under active RF reception and DSP processing load. The BMS held cutoff voltage cleanly and did not trigger false low-battery warnings during the draw spike at RF lock-on.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eContact cleaning before install:\u003c\/strong\u003e\n    The EK2020 receiver uses a recessed flat-pack connector. Oxidation on the gold pads — even light discolouration — causes intermittent contact and receiver dropouts. Wipe the pads with isopropyl alcohol before fitting the new cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReceiver dropping signal mid-broadcast after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EK2020 draws a combined load from the RF front-end and the audio DSP simultaneously. If the replacement cell has high internal resistance, voltage sags below the BMS protection threshold during that combined draw spike, triggering a momentary cutoff that reads as a signal drop. This is not a transmitter fault. Check the replacement cell's internal resistance — it should be under 150mΩ for stable operation at this load profile. A cell measuring above that threshold will sag on every RF lock-on event.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReceiver not re-syncing to transmitter after power loss\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the EK2020 loses power mid-session — either from a depleted cell or a BMS cutoff — the pairing data held in volatile memory is cleared on some firmware versions. The receiver comes back on but fails to lock onto the transmitter. This is not a fault with the new battery. Power on the transmitter first, then power on the receiver, and run a manual RF scan from the receiver menu to re-establish the link. Once re-paired on stable power, the sync persists across normal power cycles.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426165325914,"sku":"BWCS-SEK202SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426165358682,"sku":"BWCS-SEK202SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426165391450,"sku":"BWCS-SEK202SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SEK202SL-1.webp?v=1779930458","url":"https:\/\/batteryweb.com\/products\/sennheiser-ek2020-replacement-battery-37v-1500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}