{"product_id":"nortel-4027-replacement-battery-37v-1200mah-li-ion","title":"Nortel 690104 Compatible Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNortel 4027 \/ 4070 Series — 3.7V Li-ion Replacement Battery (690104)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1200mAh Li-ion battery replaces the OEM 690104 pack in the Nortel 4027 and 4070 cordless handsets, including NTTQ81EAE6 and NTTQ82EAE6 variants. It fits the same battery bay and connects through the same 3-pin contact as the original. Capacity figure is from the product specification — 1200mAh \/ 4.44Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e4027 and 4070 platform compatibility:\u003c\/strong\u003e\n    Both models run on the same 3.7V single-cell Li-ion rail with identical connector pinout and BMS handshake logic. One pack covers the full family without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a 4070 handset. The BMS held the cutoff voltage correctly and the base station registered a full charge without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for this handset:\u003c\/strong\u003e\n    After installing the new pack, seat the handset in the base and leave it for a full uninterrupted charge cycle before first use. Li-ion cells shipped in partial state of charge need one complete cycle to let the BMS calibrate the capacity gauge accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTalk time shorter than expected after fitting the 690104 replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell arrives from storage at roughly 40–60% charge, and the BMS capacity register is uncalibrated. The handset's fuel gauge reads from that uncalibrated baseline, so it reports low battery earlier than the actual cell capacity justifies. Run two to three full charge-discharge cycles through normal use and the gauge resets to the correct 1200mAh reference. After that, talk time should match the rated capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHandset not re-pairing with the base after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery from a DECT handset clears volatile memory on some Nortel 4000-series units, which drops the stored base station registration. The handset powers up looking for a pairing it no longer holds. To fix this, place the handset in the base, hold the locator or find button on the base for five seconds, then follow the pairing sequence from the handset menu. No factory reset of the base is needed — only the handset-side registration has to be re-established.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339916083290,"sku":"BWCS-AY4020CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339916116058,"sku":"BWCS-AY4020CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339916148826,"sku":"BWCS-AY4020CL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AY4020CL_1.webp?v=1778366906","url":"https:\/\/batteryweb.com\/products\/nortel-4027-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}