D-Link DWR-330 Replacement Battery 3.7V 1500mAh Li-ion

D-Link DWR-330 — 3.7V Li-ion Replacement Battery (DWR-330)

This is a 3.7V 1500mAh Li-ion battery for the D-Link DWR-330 portable mobile hotspot. It replaces the original cell when the device no longer holds a charge or fails to power on after a full charge cycle. Dimensions are 66.40 × 43.80 × 5.20mm — confirm before ordering.

• DWR-330 platform fit: The DWR-330 uses a slim single-cell Li-ion pack with a low-voltage BMS cutoff matched to the device's modem and Wi-Fi radio draw. This replacement uses the same cell configuration and connector orientation to maintain normal BMS communication with the hotspot firmware.
• Bench tested on actual hardware: We cycled this battery under simultaneous LTE modem and Wi-Fi radio load — the BMS held stable voltage delivery without triggering early cutoff, and the hotspot maintained a full client session throughout the discharge cycle.
• Ventilation during extended sessions: Keep the DWR-330 in an open, ventilated spot during long hotspot sessions. When connected devices are at the edge of range, the cellular radio runs at peak output power continuously — the combined heat from the modem and battery in a confined space accelerates cell degradation faster than normal use patterns.

Why the DWR-330 drops connections mid-session under maximum client load

The DWR-330 runs both a cellular modem and a Wi-Fi radio from a single 3.7V cell. At maximum connected clients, combined current draw spikes sharply — especially when the modem is retransmitting in a weak signal area. An aged or partially degraded battery sags below the BMS protection threshold during those spikes, triggering a momentary shutdown that drops all connected users. A fresh cell with full capacity handles the peak draw without the voltage sag that causes the cutoff.

DWR-330 showing charged but won't power on after sitting unused

If the hotspot was stored without use for several weeks, the battery may have self-discharged below the minimum boot voltage — typically around 3.0V for this cell chemistry. At that level, the device draws power but the BMS blocks output to protect the cell, so the power LED either stays off or flashes once and cuts out. Connect the charger and leave it for at least 30–40 minutes before attempting to power on — most BMS circuits require a trickle pre-charge phase to bring the cell back above 3.0V before normal boot is permitted.