{"product_id":"frontier-nvg589-replacement-battery-74v-5600mah-li-ion","title":"Frontier NVG589 Cable Modem Replacement Battery 7.4V 5600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFrontier NVG589 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 5600mAh Li-ion battery replaces the backup cell inside the Frontier NVG589 residential gateway. The NVG589 combines modem and router functions into one unit, and this battery keeps it running during a power outage. Without a functioning backup battery, any outage immediately kills your internet and VoIP service.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNVG589 gateway compatibility:\u003c\/strong\u003e\n    The NVG589 draws power from this cell through an integrated battery management circuit that monitors charge state and reports status to the gateway firmware. The physical footprint — 83.30 x 79.20 x 21.40mm — matches the OEM battery tray exactly, so no modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle on the NVG589 and confirmed the BMS handshake completed, battery status indicators cleared, and the gateway firmware accepted the new cell without a persistent fault flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for NVG589:\u003c\/strong\u003e\n    After installing, leave the gateway plugged into mains power for at least four hours before testing backup mode. The NVG589 firmware will not activate the battery for emergency power until the charge controller confirms a full cycle has completed.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery self-test failing after a swap on the NVG589\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe NVG589 runs an automatic battery self-test shortly after the gateway boots or detects a new cell. If the battery has not yet reached full charge, this test will fail and the gateway logs a battery fault. This is not a defective battery — it is the firmware rejecting a cell that has not yet hit the minimum voltage threshold for standby use. Allow a full four-hour charge on mains power, then reboot the gateway to trigger a fresh self-test cycle. The battery status LED should clear once the cell holds above 8.0V at rest.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoIP calls drop during outage but internet stays up\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eVoIP on the NVG589 draws more sustained current than a basic data connection — the voice processing hardware runs on a separate power rail that the battery must support at a higher load. If the backup battery is partially degraded or not fully charged, the gateway will shed the VoIP rail first to protect the data connection. A fresh cell at full charge resolves this in most cases. Confirm the battery reads a full charge state in the gateway admin panel at 192.168.0.1 before testing voice during a simulated outage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333520228442,"sku":"BWCS-ART589RC-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333520261210,"sku":"BWCS-ART589RC-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333520293978,"sku":"BWCS-ART589RC-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART589RC-1.webp?v=1778212933","url":"https:\/\/batteryweb.com\/products\/frontier-nvg589-replacement-battery-74v-5600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}