{"product_id":"nortel-kirk-4080-replacement-battery-37v-950mah-li-ion","title":"Nortel Kirk 4080 Li-ion Replacement Battery 3.7V 950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNortel Kirk 4080 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 950mAh Li-ion replacement battery for the Nortel Kirk 4080 enterprise cordless handset. It slots into the handset's battery bay and powers the DECT radio, display, and audio circuits during calls and standby. Voltage and cell chemistry match the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKirk 4080 handset fit:\u003c\/strong\u003e\n    The Kirk 4080 runs a single-cell 3.7V Li-ion pack. The BMS in this handset monitors cell voltage and trips if the pack voltage drifts outside its acceptance window — so matching chemistry and nominal voltage matters, not just physical size.\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 the Kirk 4080 platform. The BMS accepted the cell without fault codes, and the protection circuit responded correctly to end-of-charge and low-voltage cutoff events.\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 Kirk base cradle and leave it undisturbed for a full charge cycle before making calls. The Kirk 4080 base charges at a low trickle rate — removing the handset early will leave the cell partially charged and compress usable capacity from the first session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Kirk 4080 shows a low-battery warning shortly after a new pack is installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells shipped from storage arrive with a partial state of charge — typically between 40% and 60%. The Kirk 4080's fuel gauge reads this as a near-depleted pack because it has not yet seen a full charge-to-discharge reference cycle. The handset calibrates its battery indicator against a known full-charge baseline. Until that first complete charge cycle finishes in the base, the low-battery icon is a calibration artefact, not a sign of a faulty battery.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eKirk 4080 not pairing or losing its DECT registration after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the original battery cuts all power to the handset's non-volatile memory circuit. On some Kirk 4080 units, DECT pairing data is held in volatile RAM backed by the battery — a full power loss clears it. The fix is to re-register the handset at the base station using the Kirk system's subscription procedure, not to swap the battery again. Check that the base is powered and in registration mode, then follow the Kirk 4080 pairing sequence from the handset menu.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339919523930,"sku":"BWCS-CIP502CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339919556698,"sku":"BWCS-CIP502CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339919589466,"sku":"BWCS-CIP502CL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CIP502CL-1.webp?v=1778366983","url":"https:\/\/batteryweb.com\/products\/nortel-kirk-4080-replacement-battery-37v-950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}