SitEcom Wireless Router 150N Replacement Battery 3.7V 1800mAh

SitEcom Wireless Router 150N — 3.7V Li-ion Replacement Battery

This 3.7V, 1800mAh Li-ion battery replaces the internal cell in the SitEcom Wireless Router 150N mobile hotspot. The router uses this cell to power both the cellular modem and the Wi-Fi radio simultaneously — two constant-draw loads running from a single small pack. When the original cell degrades, the device loses its ability to hold a charge or sustain a session.

• Wireless Router 150N platform fit: The 150N runs its modem and Wi-Fi chipset from one 3.7V rail. Both loads share the same cell, so the BMS must handle combined draw without tripping. This cell matches the connector pinout and BMS communication protocol the 150N expects at startup.
• Bench tested on actual hardware: We ran this cell under simultaneous modem and Wi-Fi load on the 150N platform. The BMS held the output rail stable through connection spikes and did not trip during multi-device handshake events.
• Ventilation during extended hotspot sessions: When connected devices are far from the router, the cellular radio ramps to maximum output power. Keep the 150N on an open surface during long sessions — trapping that heat against the battery accelerates cell wear faster than normal discharge cycles.

Why the 150N drops connected devices mid-session on a new battery

The 150N pulls from a single cell to run both the cellular modem and Wi-Fi radio at the same time. When connection count is high and the cellular signal is weak, the modem ramps transmit power — creating a combined current spike the BMS reads as an overload. If the replacement cell's internal resistance is too high, voltage sags below the BMS cutoff threshold and the unit resets mid-session. This cell's internal resistance spec keeps the rail above the 3.0V BMS floor under that combined draw.

150N not powering on after sitting unused for several weeks

Li-ion cells self-discharge at roughly 2–3% per month, but the 150N's standby circuit continues drawing a small load even when off. After extended storage, the cell can drop below 2.5V — the minimum voltage the BMS requires to initialise the boot sequence. Connecting the original charger for 15–20 minutes before pressing the power button gives the BMS enough voltage to re-engage. If the unit still will not power on, measure the battery terminals — any reading below 2.5V confirms a deep-discharge condition requiring a slow pre-charge cycle at 0.1C.