Novatel Wireless MiFi2200 Replacement Battery 3.7V 1250mAh

Novatel Wireless MiFi2200 — 3.7V Li-ion Replacement Battery (40115114.00)

This 3.7V, 1250mAh Li-ion battery fits the Novatel Wireless MiFi2200 portable hotspot. It replaces OEM part numbers 40115114.00, 3-1826107-9, and L01478001. The MiFi2200 runs a combined cellular modem and Wi-Fi radio load, so the battery management system on this cell is rated to handle both simultaneously.

• MiFi2200 platform fit: The MiFi2200 uses a single flat Li-ion cell at 3.7V nominal. The connector pinout and BMS handshake are matched to this unit — the device will reject cells that don't pass the voltage identification check at startup.
• Bench tested on actual hardware: We ran this battery under a combined modem-plus-Wi-Fi load simulating five connected clients. The BMS held steady through the startup surge and maintained voltage within spec across a full discharge cycle.
• Ventilation during extended sessions: Keep the MiFi2200 on an open surface when connected clients are far from the hotspot — the cellular radio ramps to maximum transmit power in that condition, which raises case temperature and stresses the cell over long sessions.

Why the MiFi2200 disconnects users mid-session on a full charge

The MiFi2200 draws power from two sources simultaneously — the cellular modem and the Wi-Fi radio. When all five client slots are active and the cellular signal is weak, combined current draw spikes well above the average load. An aged or faulty cell can't sustain the voltage under that spike, and the BMS cuts output to protect the cell. The device reboots, dropping all connected clients even though the charge indicator showed near-full. A fresh cell with intact capacity handles the surge without the voltage dip that triggers the cutoff.

MiFi2200 won't power on after sitting unused for several weeks

Li-ion cells self-discharge during storage — the MiFi2200 draws a small standby current even when powered off, accelerating the drain. If the cell drops below approximately 3.0V, the device's boot sequence won't initiate because the BMS blocks startup below minimum safe voltage. Connect the hotspot to its charger and leave it for at least 30 minutes before pressing the power button — this allows the charger to bring the cell above the 3.0V boot threshold. If the charge indicator doesn't light within five minutes of connecting, the cell has likely dropped into deep discharge and will need a longer recovery charge before the BMS re-enables output.