{"product_id":"nec-i755-replacement-battery-37v-650mah-li-ion","title":"NEC i755 Cordless Phone Compatible Battery 3.7V 650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNEC i755 Series — 3.7V Li-ion Replacement Battery (690109)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion battery rated at 650mAh (2.41Wh), built to the same spec as the original NEC part number 690109. It fits the NEC i755, i755d, and i755S cordless handsets. Install it when the original pack no longer holds charge or the handset dies well before you end a call.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ei755 \/ i755d \/ i755S fit:\u003c\/strong\u003e\n    These three handsets share the same battery bay dimensions, connector pinout, and 3.7V Li-ion cell requirement. One pack covers the whole family — no adapters or rewiring needed.\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 bench and verified the BMS held cutoff voltage correctly at both ends — no under-voltage sag that would trigger the handset's low-battery alert prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after install:\u003c\/strong\u003e\n    Place the handset in the base and leave it seated for a full charge cycle before making calls. Li-ion cells shipped in storage state need one complete charge to calibrate the handset's fuel gauge — skipping this often makes the battery meter read inaccurately for the first week.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the i755 handset shows low battery sooner than expected after a swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe i755 reads remaining capacity by tracking voltage curves across a full charge cycle. A new Li-ion cell shipped in partial storage state has a compressed voltage profile until it completes its first full cycle. The handset's gauge interprets this compressed curve as low capacity and triggers the warning early — even though the cell itself is fine. After one full charge from flat to full, the voltage curve normalises and the indicator tracks correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHandset not pairing with base station after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome DECT phones lose their handset-to-base pairing record when power is fully removed during a battery swap. The handset and base both store pairing keys in volatile memory, and a hard power loss can wipe the handset side. If the handset shows \"searching\" or \"unregistered\" after install, press and hold the Find\/Page button on the base for 5–10 seconds to re-enter registration mode, then re-register the handset through its menu. This does not require a factory reset of the base.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339893080154,"sku":"BWCS-NSV810CL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339893112922,"sku":"BWCS-NSV810CL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339893145690,"sku":"BWCS-NSV810CL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NSV810CL-1.webp?v=1778366907","url":"https:\/\/batteryweb.com\/products\/nec-i755-replacement-battery-37v-650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}