Verizon 4G Router Compatible Battery 3.7V 3400mAh

Verizon 4G Router — 3.7V Li-ion Replacement Battery

This 3.7V, 3400mAh Li-ion battery replaces the internal cell in the Verizon 4G mobile hotspot router. It fits the portable hotspot unit that creates a shared Wi-Fi network over a cellular connection. Capacity figure is taken directly from product specification — 12.58Wh total energy.

• Hotspot platform fit: The 4G router runs its modem and Wi-Fi radio from the same single-cell 3.7V rail. Any replacement cell must match that nominal voltage exactly — mismatched cells cause the BMS to reject the pack on first boot or trip a low-voltage cutoff mid-session.
• Bench tested on actual hardware: We cycled this cell under combined modem-plus-Wi-Fi load across multiple connected clients. The BMS held the discharge curve steady and did not trip early cutoff during the high-draw phase of a fresh connection burst.
• Ventilation during extended sessions: Keep the hotspot on an open surface when running for long periods. The cellular radio runs at full output power when client devices are far away, and that heat transfers directly into the battery cell — trapping it in a bag or pocket accelerates cell wear faster than any other single factor on this device.

Mobile hotspot disconnecting users mid-session on a new battery

This happens when multiple clients connect simultaneously and the combined modem-plus-Wi-Fi draw pulls the cell voltage below the BMS cutoff threshold momentarily. A fresh but undercharged cell is especially vulnerable — internal resistance is higher until the cell has completed two or three full charge cycles. The BMS reads a voltage sag as a fault and resets the radio stack, which drops all connected clients. Charge the replacement cell to 100% before the first session and let it cool to room temperature before use.

Hotspot not powering on after sitting unused for several weeks

Li-ion cells self-discharge at roughly 1–3% per month, but the hotspot's standby firmware draws a small parasitic current even when powered off — that adds up fast. If the cell drops below approximately 3.0V, the BMS locks the pack and the unit will not boot even when plugged into a charger. Connect it to the OEM charger and leave it for at least 30–60 minutes before pressing the power button — most BMS circuits require a trickle pre-charge phase to unlock the pack before normal charge current resumes.