{"product_id":"avaya-3641-replacement-battery-37v-1800mah-li-ion","title":"Avaya 3641 Replacement Battery 3.7V 1800mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAvaya 3641 \/ 3645 IP Wireless Telephone — 3.7V Li-ion Replacement Battery (700430457)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1800mAh Li-ion battery replaces the original pack in the Avaya 3641 and 3645 IP Wireless Telephone handsets. It fits models listed under OEM part numbers 700430457, 700430473, BATT-BPL200, BPL100, and PBP0850. Same voltage rail, same connector footprint, same BMS handshake the base station expects.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3641 and 3645 platform fit:\u003c\/strong\u003e\n    Both handsets share the same battery bay dimensions and BMS communication protocol over the charging contacts. The base station negotiates charge current with the pack directly — swapping to this battery preserves that handshake without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the 3641 base station and confirmed the BMS accepted charge termination correctly. Voltage held steady at 3.7V nominal under RF transmit load without triggering low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge on the 3641 base:\u003c\/strong\u003e\n    Seat the handset in the base immediately after installing this battery and leave it for a full charge cycle before first use. Li-ion packs shipped in storage mode may report artificially low capacity on the first cycle — a complete base-station charge corrects the fuel gauge calibration.\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 the original battery after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion pack sometimes delivers less talk time than expected for the first two or three cycles. This happens because the cell's internal chemistry hasn't fully activated from the partial state of charge used during shipping and storage. Each full discharge and recharge cycle allows the electrolyte to wet the electrode surfaces more completely. Run two or three full charge cycles on the base station before comparing performance against the original — capacity typically stabilises by cycle three.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHandset loses DECT pairing after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery from a DECT handset drops all power to RAM, which clears the stored pairing record on some 3641 firmware versions. The base station retains its side of the registration, but the handset comes back up unregistered. To re-pair, hold the handset's subscription button and initiate registration from the base station admin menu — the process takes under two minutes and restores full call function. No factory reset of the base is needed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339933876314,"sku":"BWCS-BPL100CL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339933909082,"sku":"BWCS-BPL100CL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339933941850,"sku":"BWCS-BPL100CL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BPL100CL-1.webp?v=1778366983","url":"https:\/\/batteryweb.com\/products\/avaya-3641-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}