Huawei E589 HB5P1H Replacement Battery 3.7V 2600mAh

Huawei E589 / E5776 Series — 3.7V Li-Polymer Replacement Battery (HB5P1H)

This is a 3.7V, 2600mAh (9.62Wh) Li-Polymer battery using OEM part number HB5P1H. It fits the Huawei E589, E5776, E5776S, and related portable WiFi hotspot models. When the original cell degrades and the hotspot dies mid-session or won't hold a charge, this replaces the failed cell directly.

• E589 and E5776 series compatibility: These models share the same single-cell 3.7V Li-Polymer platform, the same HB5P1H connector pinout, and the same BMS handshake protocol. A battery that works in the E589 communicates correctly with the E5776 charge controller without modification.
• Bench tested on actual hardware: We ran this cell under combined WiFi broadcast and active LTE modem load — the BMS held the voltage rail steady and the protection circuit tripped correctly at low-cell threshold, cutting output before damage rather than crashing mid-session.
• Signal environment and battery load: Keep the hotspot near a window or in a location with strong signal. When the LTE modem works at maximum transmit power in weak-signal areas, battery drain accelerates sharply and heat builds inside the chassis — both accelerate cell wear over time.

Hotspot disconnecting users mid-session on a new battery

The E589 and E5776 run two power-hungry subsystems simultaneously — the LTE modem and the WiFi radio. At maximum connected devices, the combined current draw spikes and can cause a brief voltage sag on a weak or partially discharged cell. The BMS interprets that sag as an under-voltage event and cuts output to protect the cell, which the hotspot firmware reads as a power failure. If disconnects happen at peak connection count, reduce connected devices to confirm the cause, and check that the battery contact pins are clean and fully seated.

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

Li-Polymer cells self-discharge during storage, and the HB5P1H is no exception. If the cell drops below approximately 3.0V, the BMS locks output to prevent damage to the cell — the hotspot shows no sign of life even when plugged in. Plug the device into a USB charger and leave it for 20–30 minutes before pressing the power button; most BMS circuits on this cell recover and resume normal charging once the charger pushes the voltage back above the minimum boot threshold. If the device still won't respond after a full hour on charge, the cell has dropped below recovery voltage and needs replacement.