{"product_id":"pegatron-dpq3925-replacement-battery-108v-3400mah-li-ion","title":"Pegatron DPQ3925 Cable Modem Replacement Battery 10.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePegatron DPQ3925 \/ DPQ3939 \/ DPQ3212 — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 3400mAh Li-ion backup battery for the Pegatron DPQ3925, DPQ3939, and DPQ3212 cable modems. It sits inside the modem and takes over power delivery when mains power drops. Without a functioning backup battery, the modem shuts down immediately during an outage — taking VoIP calls, alarm system connections, and any internet-dependent service with it.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDPQ3925 \/ DPQ3939 \/ DPQ3212 compatibility:\u003c\/strong\u003e\n    These three Pegatron DOCSIS modem models share the same internal battery bay, connector pinout, and BMS handshake protocol. A single cell spec covers all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the DPQ3925 charge controller and confirmed the BMS accepted the new battery without error flags. The modem firmware polled the cell correctly and moved into charge mode within two minutes of installation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirmware charge acceptance before first outage test:\u003c\/strong\u003e\n    After installing, let the modem charge the battery continuously for at least four hours before cutting mains power to test it. The modem firmware runs an internal capacity validation sequence and will not commit the battery to emergency duty until that cycle completes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eModem showing battery error after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA battery error light or status warning on the DPQ3925 immediately after swapping the cell is not a sign of a faulty battery. The modem firmware runs a multi-hour cell authentication and charge cycle before it clears the error flag. This process checks internal resistance, voltage curve, and charge acceptance rate against expected values. Leave the modem plugged in for 24 hours — the error clears once firmware marks the cell as verified and fully charged.\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 are not equal loads on the backup battery. The modem's power management firmware prioritises the DOCSIS data connection, which draws less sustained current, over the VoIP telephony module, which spikes current during call setup. If the battery has not completed a full charge cycle, the cell voltage sags under the VoIP load and the telephony module shuts off while data continues. Confirm the battery reads at or above 12.0V under the modem's battery status page, then retest calls.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333522817114,"sku":"BWCS-CPB013RX-1","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333522849882,"sku":"BWCS-CPB013RX-2","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333522882650,"sku":"BWCS-CPB013RX-3","price":77.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPB013RX-1.webp?v=1778212933","url":"https:\/\/batteryweb.com\/products\/pegatron-dpq3925-replacement-battery-108v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}