Novatel Wireless MiFi 2352 Compatible Battery 3.7V 1100mAh

Novatel Wireless MiFi 2352 / MiFi 2372 — 3.7V Li-ion Replacement Battery (40123108-00)

This 3.7V, 1100mAh Li-ion battery is a direct replacement for the Novatel Wireless MiFi 2352 and MiFi 2372 mobile hotspot. It slots into the same bay as the original 40123108-00 cell and uses the same three-contact connector. Capacity is rated at 4.07Wh — identical to the OEM spec.

• MiFi 2352 and 2372 compatibility: Both models share the same battery bay dimensions, voltage rail, and BMS handshake protocol. The connector pinout and cell dimensions — 65.17 × 42.87 × 4.47mm — are identical across both units, which is why a single cell covers both.
• Bench tested on actual hardware: We ran this cell under combined modem and Wi-Fi load — four connected clients, active data transfer — and monitored the BMS cutoff thresholds. Voltage held steady through the discharge curve with no spurious low-voltage shutdowns during the session.
• Ventilation during extended hotspot sessions: When your hotspot is far from a cellular tower, the radio pushes to maximum transmit power. Keep the unit on an open surface rather than inside a bag or pocket during long sessions — trapped heat accelerates cell stress at the chemistry level.

Why the MiFi 2352 drops connected devices mid-session under heavy client load

When four or five devices are all pulling data simultaneously, the combined modem and Wi-Fi radio draw spikes sharply. An aged cell can't sustain the current without voltage sagging below the BMS protection floor — triggering a momentary shutdown even if the battery indicator still shows charge. This replacement cell has the same 1100mAh rating as the OEM unit, so the BMS threshold behaviour at load should match what the device expects. If drop-outs persist, reduce connected clients to two or three and check whether the issue disappears — that confirms a load-induced sag rather than a firmware fault.

MiFi 2352 won't power on after sitting unused for several weeks

Li-ion cells self-discharge at roughly 2–3% per month at room temperature. If a MiFi 2352 sits unused long enough, the cell can drop below the minimum boot voltage — typically around 3.0V — and the device simply won't respond to the power button. Plug it into a USB charger and leave it for 20–30 minutes before attempting to power on; the BMS needs a trickle charge cycle to bring the cell voltage back above the boot threshold. If the device still won't respond after that charge window, measure voltage at the battery terminals — a reading below 2.5V indicates the cell has passed recovery range and needs replacement.