{"product_id":"panasonic-wx-ct2020-replacement-battery-36v-1500mah-ni-mh","title":"Panasonic WX-C2020BAT Wireless Headset Replacement Battery 3.6V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic WX-CT2020 \/ Ultraplex II — 3.6V Ni-MH Replacement Battery (WX-C2020BAT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 1500mAh Ni-MH replacement battery for the Panasonic WX-CT2020 and Ultraplex II wireless headsets. It slots into the headset's battery compartment and powers the combined audio circuit, speaker, microphone, and DECT radio transceiver. OEM part numbers WX-C2020BAT, 2020BAT, and PA04940398 all cross-reference to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWX-CT2020 and Ultraplex II compatibility:\u003c\/strong\u003e\n    Both headsets run on the same 3.6V single-cell Ni-MH architecture and share an identical battery footprint, connector orientation, and BMS handshake protocol with the base station — which is why one part number 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 charge and discharge on the WX-CT2020 base station, confirming the BMS completed its handshake, the charge indicator activated correctly, and the protection circuit tripped at the expected low-voltage threshold without dropping the headset mid-cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge protocol for DECT headsets:\u003c\/strong\u003e\n    On first use, seat the headset in the base station and run a full uninterrupted charge cycle before taking a call. The base needs to log the new cell before its talk-time estimate registers correctly — skipping this step causes the indicator to report inaccurate charge levels 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\"\u003eBase station not recognising the new pack after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe WX-CT2020 base station performs a BMS handshake when a battery is first seated. If the cell arrives at storage voltage — typically around 3.2V on a Ni-MH pack — the base may not register it as a valid battery and will withhold the charge signal. This is not a fault with the battery or the base. Place the headset in the cradle and leave it undisturbed for at least 30 minutes — the base station needs that window to detect the cell and initiate the charge cycle. Once the charge LED activates, the handshake is complete and normal operation resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHeadset cuts out mid-call even with a recently charged battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMid-call dropout on the WX-CT2020 is usually a voltage sag issue, not a dead battery. The headset draws current simultaneously from the audio amplifier, microphone circuit, and DECT radio — that combined load pulls the cell voltage down sharply during active transmission. If the Ni-MH cell is not fully conditioned, its internal resistance is higher than rated, and the protection circuit interprets that voltage dip as a low-battery cutoff event. Run three to five full charge-discharge cycles through the base station to condition the cell and reduce internal resistance — after conditioning, the resting voltage between calls should stabilise above 3.4V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428158439514,"sku":"BWCS-PWT202SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428158472282,"sku":"BWCS-PWT202SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428158505050,"sku":"BWCS-PWT202SL-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PWT202SL_1.webp?v=1779934278","url":"https:\/\/batteryweb.com\/products\/panasonic-wx-ct2020-replacement-battery-36v-1500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}