{"product_id":"motorola-sbv5220-replacement-battery-108v-3400mah-li-ion","title":"Motorola SBV5220 Replacement Battery 10.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola SBV5220 \/ SBV5221 Series — 10.8V Li-ion Replacement Battery (515757-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 3400mAh lithium-ion battery replaces the internal backup cell in the Motorola SBV5220, SBV5221, SURFboard SBV5222, and Surfboard Digital Voice Modem SB5220. It holds the modem online during a power outage, keeping both data and VoIP active until utility power returns. OEM part numbers 515757-001 and 535625-001-00 both cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSBV5220 \/ SBV5221 \/ SBV5222 platform fit:\u003c\/strong\u003e\n    These three modems share the same 10.8V three-cell pack format, connector pinout, and BMS handshake protocol. The SBV5222 adds one additional port but draws from the same battery bay — voltage rail and BMS communication remain identical across the family.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell in an SBV5220 and monitored the BMS charge acceptance sequence. The modem firmware began balancing the pack within 20 minutes of installation, and the BMS reported a healthy cell after a full charge cycle with no error flags thrown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installing, leave the modem plugged into mains power for a full four hours before testing backup function. The SBV5220 firmware will not commit the battery to emergency use until it has completed one full supervised charge cycle — pulling the plug before that window ends triggers a false battery error.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SBV5220 drops VoIP during an outage but keeps the data light on\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SBV5220 prioritises its DOCSIS data channel when running on battery backup. VoIP requires sustained higher power than a basic data connection — the modem's power management firmware can shed the voice subsystem first if the backup cell cannot deliver adequate current. A degraded original cell often passes the modem's basic battery-present check but fails under the load spike the voice processor creates at call setup. Replacing with a full-capacity 3400mAh cell and completing the four-hour initial charge resolves this in most cases.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error light after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA steady or flashing battery error indicator after swapping the cell does not mean the new battery is faulty. The SBV5220 firmware runs an internal battery-check sequence that can take up to 24 hours after a new cell is installed before it clears the error flag. The BMS needs to complete at least one full charge-discharge handshake with the modem controller. If the error light persists beyond 24 hours on mains power, check that the battery connector is fully seated — the three-pin connector requires firm pressure until it clicks flush.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522686042,"sku":"BWCS-MBV522RX-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333522718810,"sku":"BWCS-MBV522RX-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333522751578,"sku":"BWCS-MBV522RX-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBV522RX-1.webp?v=1778212954","url":"https:\/\/batteryweb.com\/products\/motorola-sbv5220-replacement-battery-108v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}