Huawei E587 4G Compatible Battery HB5A5P2 3.7V 2000mAh

Huawei E587 4G Mobile Hotspot — 3.7V Li-ion Replacement Battery (HB5A5P2)

This 3.7V 2000mAh Li-ion battery replaces the original HB5A5P2 cell in the Huawei E587 4G mobile hotspot. It also fits the GP02 and DATA06 portable wireless routers that share the same battery bay and connector. Capacity is 7.4Wh — matched to the original specification.

• E587, GP02, and DATA06 compatibility: These three Huawei hotspot models share the same physical cell format, 3.7V nominal rail, and BMS handshake protocol — one battery fits all three without modification or adapter.
• Bench tested on actual hardware: We ran this battery in an E587 4G unit under simultaneous modem and Wi-Fi load with five connected clients. The BMS held the output rail stable and did not trigger a false low-voltage cutoff during peak transmission bursts.
• Ventilation during extended sessions: Keep the E587 flat and uncovered on a hard surface when running continuous sessions. The cellular radio runs at full transmit power when connected devices are at range, generating enough heat to accelerate cell wear if the hotspot is pocketed or placed face-down.

Why the E587 drops connected clients mid-session under heavy load

The E587 runs two radios simultaneously — the cellular modem and the Wi-Fi access point. At maximum client count, combined current draw spikes sharply during data bursts. A battery with degraded cells cannot sustain the voltage rail during these spikes, and the BMS interprets the sag as a critically low state and cuts output. A fresh cell with full capacity holds the rail through those bursts without tripping the cutoff.

E587 showing fully charged but shutting down minutes after unplugging

This symptom means the fuel gauge has lost calibration against the actual cell capacity — the battery reports 100% but the usable charge window has collapsed. It happens when the original cell has aged past the point where its internal resistance allows a meaningful discharge curve. The fix is a full replacement, not a recalibration cycle. After fitting this battery, run one complete charge to 4.2V before first use to let the BMS establish an accurate baseline.