{"product_id":"cisco-dpq3925-replacement-battery-108v-2200mah-li-ion","title":"Cisco DPQ3925 Replacement Battery PB013 10.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCisco DPQ3925 \/ DPQ3212 — 10.8V Li-ion Replacement Battery (PB013)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 2200mAh Li-ion battery for the Cisco DPQ3925 and DPQ3212 cable modem gateways. It slots into the battery bay on the underside of these units and provides backup power to keep your internet and VoIP service running during a power outage. OEM part numbers PB013, 4033435, SMPCM1, and FLK644A all cross to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 and DPQ3212 compatibility:\u003c\/strong\u003e\n    Both modems share the same 10.8V three-cell battery architecture, the same physical bay dimensions, and the same BMS handshake protocol. One cell fits both units without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery in a DPQ3925 under simultaneous data and VoIP load. The BMS accepted the cell within the normal firmware window, self-test passed, and the backup indicator lit correctly after a full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for cable modem backup cells:\u003c\/strong\u003e\n    After installation, leave the modem plugged in and powered on for at least four hours before testing backup mode. The modem firmware gates emergency power use on a completed charge cycle — pulling AC too early will show a battery fault even when the cell itself is fine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery error light stays on after installing the PB013\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DPQ3925 runs a firmware-side battery acceptance sequence after any new cell is connected. This sequence can take up to 24 hours to complete on a fresh cell. During that window the modem may display a battery fault LED even though the cell voltage and connections are correct. Do not remove and reinstall the battery — that resets the timer. Leave the modem on AC power and let the charge cycle run to completion before drawing any conclusions about the cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInternet stays up during outage but VoIP calls drop immediately\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eData traffic and VoIP traffic draw different sustained power levels from the backup battery. The DPQ3925 prioritises the DOCSIS downstream first, so a partially charged or lightly degraded battery can maintain a data connection while failing to sustain the higher continuous current the telephony module needs. Check that the battery has completed a full charge cycle — the cell voltage should sit at approximately 12.6V when fully charged. If VoIP still drops after a confirmed full charge, the battery capacity has fallen below the modem's minimum telephony threshold and the cell needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333527076954,"sku":"BWCS-CPB013RC-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333527109722,"sku":"BWCS-CPB013RC-2","price":62.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333527142490,"sku":"BWCS-CPB013RC-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RC-1.webp?v=1778212933","url":"https:\/\/batteryweb.com\/products\/cisco-dpq3925-replacement-battery-108v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}