Haier H15418 DC002 Hotspot Compatible Battery 3.8V 2200mAh

Haier DC002 / DC003 / DC013 — 3.8V Li-ion Replacement Battery (H15418)

This 3.8V, 2200mAh (8.36Wh) Li-ion battery replaces the OEM H15418 cell in the Haier DC002, DC003, and DC013 mobile hotspot devices. All three models share the same battery bay, connector, and BMS handshake requirements. It ships at partial charge — top it up before the first session.

• DC002, DC003, DC013 compatibility: Haier uses the same 3.8V power rail and H15418 connector spec across this hotspot family. The BMS on each model accepts the same charge termination voltage, so one cell fits all three without modification.
• Bench tested on actual hardware: We ran the DC002 under a simulated five-device load with the cellular radio active. The BMS held charge termination at 4.35V and cut low-voltage protection cleanly at 3.0V with no false trips mid-session.
• Ventilation during extended sessions: Keep the hotspot on an open surface when running extended sessions. When connected devices are far from the hotspot, the cellular radio transmits at maximum output power. That heat cycles directly into the battery — enclosed pockets or bags accelerate cell wear over time.

Hotspot disconnecting users mid-session on a new battery

The DC002 draws from two power loads simultaneously — the cellular modem and the WiFi radio. At maximum connected devices, combined current draw can cause brief voltage sag below the BMS protection threshold, triggering a momentary cutoff. This usually shows up as all connected devices dropping at once rather than one at a time. Reducing the maximum connected device count in the hotspot settings lowers peak draw and stabilises the voltage rail.

Hotspot shows full charge but won't power on after weeks in a drawer

Li-ion cells self-discharge during storage, and the DC002's BMS requires a minimum voltage to initialise boot — typically around 3.2V. If the cell drops below that threshold, the device shows no response even when plugged in. Connect the original charger and leave it for 20–30 minutes without pressing the power button — the BMS needs time to trickle-charge the cell back above the boot threshold. Once the charge indicator lights, a full charge cycle will restore normal operation.