Novatel Wireless MiFi4510L Compatible Battery 3.7V 1500mAh

Novatel Wireless MiFi4510L / MiFi 3352 — 3.7V Li-ion Replacement Battery (40123111.00)

This 3.7V 1500mAh (5.55Wh) Li-ion battery replaces the original cell in the Novatel Wireless MiFi4510L, MiFi4510L 4G LTE, MIFI451, and MiFi 3352 mobile hotspot range. It slots directly into the battery bay and communicates with the device BMS using the same handshake as the OEM unit. Confirmed compatible with OEM part numbers 40123111.00, 40115118.003, 40115118.002, and 40115118.001.

• MiFi4510L and MiFi 3352 platform fit: These models share the same battery bay geometry, 3.7V nominal voltage rail, and three-pin connector layout — which is why a single cell covers both lines. The BMS on each device reads cell state over the same data pin, so the handshake initialises cleanly on power-up.
• Bench tested on actual hardware: We cycled this cell on a MiFi4510L with five simultaneous connected clients under sustained data load. The BMS held charge acceptance across ten full cycles with no protection-cutoff trips at either end of the voltage curve.
• Ventilation during hotspot sessions: When connected devices are far from the hotspot, the cellular radio runs at maximum transmit power. Keep the MiFi flat on a hard surface with nothing covering it — fabric or pockets trap heat and accelerate cell stress over a long session.

Why the MiFi4510L drops connected clients mid-session under full load

The MiFi4510L runs both a cellular modem and a Wi-Fi radio from the same 3.7V cell. At maximum client count, combined draw spikes sharply — especially when the modem is retransmitting in a weak signal area. If the cell's internal resistance is elevated, voltage sags below the BMS low-voltage threshold and the device resets, dropping all connected clients. A fresh cell with low internal resistance holds the voltage rail stable through those draw spikes. If drops persist, check signal strength — a weak LTE signal forces the modem to draw harder, and no battery eliminates that root cause.

MiFi4510L won't power on after sitting unused for weeks

Li-ion cells self-discharge slowly in storage. If the MiFi4510L sits long enough, the cell drops below the minimum boot voltage — typically around 3.0V — and the BMS locks out discharge to protect the cell. The device shows nothing when you press power. Connect the hotspot to a charger and leave it for 20–30 minutes before attempting to power on; the BMS needs to see enough charge to re-enable the output path. If the original cell sat discharged for months, it may not recover — that is the point at which a replacement cell is needed, and this one will initialise correctly from its shipped charge state.