D-Link DWR-131 Replacement Battery 3.7V 1800mAh Li-ion

D-Link DWR-131 / DIR-506L SharePort Go — 3.7V Li-ion Replacement Battery

This 3.7V 1800mAh Li-ion battery fits the D-Link DWR-131 mobile hotspot and the DIR-506L SharePort Go portable router. It restores power to devices that have lost charge capacity or will no longer hold a charge. Capacity is taken from product data: 1800mAh (6.66Wh).

• DWR-131, DIR-506L, and 5-BT000002 compatibility: These models share a common 3.7V single-cell Li-ion platform with the same physical footprint (52.76 × 35.35 × 11.16mm) and connector pinout — the BMS handshake and charge termination logic are identical across the range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a DWR-131 unit with four clients connected. The BMS held cutoff at the correct low-voltage threshold and did not trip spuriously under combined modem and Wi-Fi radio draw.
• Ventilation during extended sessions: Keep the hotspot on a hard, flat surface — never in a pocket or bag — during long sessions. When client devices are far from the hotspot, the cellular radio runs at full output power, generating heat that accelerates cell wear over time.

Why the DWR-131 drops all connected clients mid-session

The DWR-131 runs two radios simultaneously — the cellular modem and the 2.4GHz Wi-Fi access point. At maximum client load, the combined current draw causes voltage sag on an aged or partially depleted cell. When the cell voltage dips below the BMS low-voltage threshold momentarily, the BMS cuts output to protect the cell, which the device firmware reads as a hard power event and reboots. A fresh cell at full capacity sustains the current draw without the voltage sag that triggers the cutoff.

DWR-131 won't power on after sitting unused for weeks

Li-ion cells self-discharge at roughly 2–3% per month, and the DWR-131 draws a small standby current even when switched off. After extended storage, the cell can drop below the minimum boot voltage — typically around 3.0V — and the BMS locks output entirely. Connect the device to a 5V USB charger for at least 30 minutes before attempting to power on; this allows the charger to trickle current past the BMS lockout threshold and recover the cell to a bootable voltage of approximately 3.4V.