HyperX Cloud Alpha Replacement Battery 3.7V 1500mAh

HyperX Cloud Alpha — 3.7V Li-Polymer Replacement Battery (AEC624052)

This 3.7V, 1500mAh Li-Polymer cell replaces the original battery in the HyperX Cloud Alpha wireless headset. It restores wireless audio functionality when the original pack no longer holds a usable charge. Voltage and capacity match the OEM spec exactly — 3.7V nominal, 5.55Wh total.

• Cloud Alpha wireless platform: The Cloud Alpha draws from a single Li-Polymer cell that powers both the audio driver and the 2.4GHz wireless transceiver simultaneously. Any replacement must match the OEM voltage rail precisely — even a slight mismatch triggers the headset's low-voltage protection circuit before rated capacity is used.
• Bench tested on actual hardware: We cycled this cell through the Cloud Alpha's charge circuit and confirmed the BMS accepted the new pack without error flags. Charge termination cut off cleanly at full capacity with no overcharge event detected.
• First charge in the USB dongle base: Seat the headset in its charging cradle and run a full charge-to-completion cycle before use — the Cloud Alpha's firmware logs the new cell during this first cycle to calibrate its capacity estimate accurately.

Why the Cloud Alpha cuts out mid-session on a new battery

The Cloud Alpha pulls simultaneous current from two loads — the 40mm driver and the 2.4GHz radio. Under combined draw, a cell at storage voltage can sag below the BMS cutoff threshold even though the indicator shows charge remaining. This is not a fault in the new cell. The protection circuit is reading real-time voltage drop, not state of charge. Run two or three full charge and discharge cycles and the BMS will calibrate its cutoff reference to the actual cell capacity.

Talk time shorter than expected for the first few uses

Li-Polymer cells ship at storage voltage — roughly 3.6V — not at full formation charge. Capacity available on the first cycle is typically 80–90% of rated. The Cloud Alpha's fuel gauge reads from a reference built during charge cycles, so the estimate improves as the cell conditions. After three to five full cycles the cell reaches its rated 1500mAh and the talk-time estimate stabilises. If talk time remains short after five cycles, check the USB charging cable for adequate current delivery — the Cloud Alpha requires a 5V 500mA minimum source to charge correctly.