ZTE MF923 3.7V Replacement Battery 3000mAh Li-Polymer

ZTE MF923 / Velocity — 3.7V Li-Polymer Replacement Battery (Li3723T42P3h794977)

This 3.7V, 3000mAh Li-Polymer battery fits the ZTE MF923 and Velocity mobile hotspot units. It replaces OEM part numbers Li3723T42P3h794977 and LI3728T42P3H794977 directly. Both the MF923 and Velocity share the same battery bay dimensions and BMS communication protocol, so one part covers both models.

• MF923 and Velocity compatibility: Both hotspots run the same 3.7V power rail, use the same physical connector, and negotiate charge cycles through an identical BMS handshake. The battery footprint — 78.90 × 48.90 × 7.70mm — fits both bays without modification.
• Bench tested on actual hardware: We ran this cell through repeated charge cycles on the MF923 platform. The BMS accepted charge without fault codes, and protection circuits triggered correctly at both low-voltage cutoff and thermal thresholds.
• Ventilation during extended sessions: Keep the hotspot on a hard, open surface during long sessions. When connected devices are far from the unit, the cellular radio runs at maximum transmit power — that sustained RF output generates heat that accumulates against the battery if the unit is pocketed or covered.

Why the MF923 disconnects all connected devices mid-session on a new battery

The MF923 draws simultaneously from its cellular modem and the Wi-Fi radio. When several devices are connected and actively transferring data, instantaneous current demand spikes sharply. If the battery cell has high internal resistance — common in deeply discharged or aged cells — voltage sags below the BMS protection threshold and the unit shuts down rather than browning out. A replacement cell with lower internal resistance handles those combined draw peaks without triggering cutoff. After fitting this battery, allow one full charge cycle before heavy multi-device use so the BMS can calibrate its state-of-charge tracking.

MF923 won't power on after sitting in a bag for several weeks

Li-Polymer cells self-discharge at roughly 2–3% per month at room temperature, faster in heat. A hotspot stored in a car or warm bag can drop below the minimum boot voltage — typically around 3.0V per cell — and the BMS locks out the device entirely to prevent damage. Plugging in the charger without pressing the power button first lets the charging circuit recover the cell slowly from below the boot threshold. Once the indicator light shows any charge activity, the unit should power on normally within a few minutes and reach a usable state at 3.4V or above.