Huawei E5623 Hotspot Replacement Battery 3.6V 2000mAh

Huawei ETS5623 / 515H Series — 3.6V Ni-MH Replacement Battery (HGB-2A10x3)

This is a 3.6V, 2000mAh Ni-MH battery that fits the Huawei ETS5623, 515H, ETS3125, ETS3125i, and compatible models. It replaces OEM part numbers HGB-2A10x3, HGB-15AAx3, HGB-2A10, and BTR2260B. The battery slots directly into these compact wireless hotspot units and powers both the cellular modem and the Wi-Fi radio simultaneously.

• ETS5623 / 515H platform fit: These models share the same battery bay dimensions, connector pinout, and 3.6V supply rail. The Ni-MH cell chemistry matches the original BMS charge profile, so the hotspot's charge controller accepts the battery without fault codes or charge refusal.
• Bench tested on actual hardware: We ran this cell under combined modem and Wi-Fi load — simulating four connected clients with active data transfer. The BMS held voltage within spec throughout and did not trigger low-voltage cutoff under sustained draw.
• Ventilation during extended sessions: When connected devices are far from the hotspot, the cellular radio ramps to full output power. Set the unit on an open surface — not inside a bag or enclosed case — during long sessions. Trapped heat around a Ni-MH cell accelerates capacity fade faster than discharge cycles alone.

Why the ETS5623 drops connected clients mid-session under full load

The ETS5623 runs two power-hungry subsystems at once — the cellular modem and the 802.11 Wi-Fi radio. At maximum client connections, combined current draw spikes sharply. If the battery cell has degraded internal resistance, voltage sags below the hotspot's minimum operating threshold and the unit briefly resets, dropping all connected clients. A fresh cell with low internal resistance holds the voltage rail stable through those draw spikes and prevents the mid-session dropout.

ETS5623 won't power on after sitting unused for several weeks

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A hotspot stored unused for four to six weeks can arrive at a battery voltage too low for the BMS to allow boot. The unit shows no LED response and appears completely dead. Connect the charger and leave it for at least 30 minutes before attempting to power on — the BMS needs the cell to recover above approximately 3.0V before it will permit a startup cycle.