Buffalo DWR-PG Pocket Wifi Replacement Battery 3.7V 1800mAh

Buffalo Pocket Wifi DWR-PG — 3.7V Li-ion Replacement Battery

This is a 3.7V 1800mAh Li-ion battery for the Buffalo Pocket Wifi DWR-PG mobile hotspot. It fits directly into the DWR-PG and restores power when the original cell no longer holds a charge. Capacity is rated at 6.66Wh and matches the original specification.

• DWR-PG platform fit: The DWR-PG runs its cellular modem and Wi-Fi radio from a single 3.7V cell. The connector pinout and physical dimensions — 52.76 × 35.35 × 11.16mm — match the OEM battery bay without modification.
• Bench tested on actual hardware: We cycled this cell through combined modem and Wi-Fi load conditions. The BMS held voltage above the cutoff threshold under multi-device connection draw and returned stable readings across charge and discharge cycles.
• Ventilation during extended sessions: Keep the DWR-PG on an open surface when running extended hotspot sessions. When connected devices are far from the unit, the cellular radio pushes to maximum output power — sustained heat at that level accelerates cell degradation faster than normal use patterns.

Why the DWR-PG drops connections mid-session under full client load

The DWR-PG runs its LTE modem and Wi-Fi radio simultaneously from one 3.7V cell. At maximum client connections, combined current draw spikes and can pull cell voltage below the BMS cutoff threshold momentarily — triggering a shutdown the device reads as a crash rather than a battery event. A degraded original battery makes this worse because internal resistance rises with cycle count, amplifying the voltage sag under load. A fresh cell with lower internal resistance keeps voltage above the cutoff during those peak draw moments. If drop-outs persist after replacing the battery, reduce the maximum connected device count in the DWR-PG admin panel.

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

Li-ion cells self-discharge at roughly 2–3% per month even with no load. A DWR-PG left in a drawer for several months can arrive at a voltage below the 3.0V minimum the BMS requires to authorise a boot sequence. Plugging it in and leaving it on charge for 30–60 minutes before pressing the power button allows the charger to bring the cell back above that threshold. If the device still shows no sign of life after that period, check that the charge LED is actually illuminating — no LED means the BMS has entered deep-discharge protection and may need a longer trickle period before it accepts a normal charge current. Target 3.2V on the cell before attempting to power on.