{"product_id":"spectralink-7520-replacement-battery-37v-950mah-li-ion","title":"SpectraLink 7520 Cordless Phone Replacement Battery 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSpectraLink 7520 \/ 7540 \/ 7620 \/ 7640 — 3.7V Li-ion Replacement Battery (84743424)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 950mAh Li-ion battery replaces the original pack in SpectraLink 7520, 7540, 7620, and 7640 handsets, along with twelve additional models in the same family. It matches the OEM voltage and form factor at 51.54 x 32.75 x 8.30mm. Swap it in when the original pack no longer carries a call to the end of a shift.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e7500 and 7600 series compatibility:\u003c\/strong\u003e\n    These four models share the same battery bay dimensions, 3.7V Li-ion voltage rail, and connector pinout. A single cell fits all of them without modification or adapter.\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 a 7520 handset. The BMS held cutoff correctly at low voltage and accepted a full charge without tripping the protection circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for DECT handsets:\u003c\/strong\u003e\n    After fitting this battery, seat the handset in the base and leave it for a full 16 hours before first use. Li-ion cells shipped from storage sit at partial charge — a complete first cycle lets the BMS calibrate its state-of-charge reading 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 new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells arrive from storage at 30–50% charge. If you pull the handset off the base before a full first charge, the BMS reports a low state of charge and the handset cuts off early. Run two or three full charge-discharge cycles and talk time will stabilise at rated capacity. If it stays short after three cycles, check the base contacts for oxidation — a dirty contact raises charge resistance and the pack never reaches 4.2V at the cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpectraLink handset loses DECT pairing after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery cuts all power to the handset, including the memory that stores the DECT registration. The 7500 and 7600 series do not retain pairing through a full power loss. Re-register the handset at the base station using the subscription procedure in the system admin guide — press the pairing button on the base, then initiate subscription on the handset. The process takes under two minutes and does not require resetting the base.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339919097946,"sku":"BWCS-CIP502CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339919130714,"sku":"BWCS-CIP502CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339919163482,"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\/spectralink-7520-replacement-battery-37v-950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}