Alienware AW988 Compatible Battery 3.7V 1500mAh

Alienware AW988 — 3.7V Li-Polymer Replacement Battery

This 3.7V 1500mAh Li-Polymer cell is a direct replacement for the Alienware AW988 wireless gaming headset. It fits the internal battery bay and connects to the headset's onboard charging and protection circuit. Use the Capacity figure from the product data: 1500mAh (5.55Wh).

• AW988 wireless platform: The AW988 runs a single Li-Polymer cell to power both the audio drivers and the wireless radio simultaneously. That combined draw means the cell must hold voltage across a wider load range than a simple audio-only headset. This 3.7V pack matches the voltage rail and physical footprint the headset expects.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the AW988 platform. The BMS accepted the new pack without error flags, and charge current tapered correctly at full capacity. No voltage cutoff trips occurred under sustained combined audio and radio draw.
• First-cycle base station logging: Place the headset in the base station and let it complete one uninterrupted full charge before use. The AW988 base station logs the new cell during this cycle — skipping it causes the charge indicator to misread remaining capacity.

Why the AW988 cuts out mid-session on a new battery

The AW988 draws simultaneously from the audio circuit and the 2.4GHz wireless transmitter. On a cell that hasn't completed its first full cycle, resting voltage can sit just above the BMS low-voltage cutoff threshold. A short spike in combined draw — such as loud audio plus a wireless re-sync — pushes the cell below that threshold momentarily. The BMS shuts down the output to protect the cell, and the headset cuts out. One full charge cycle from the base station raises the cell's usable voltage window and stops this from happening.

Base station shows full charge but headset dies after short use

A new Li-Polymer cell ships at storage voltage, typically around 3.6–3.85V — not a full 4.2V charge. The base station's charge indicator reads the cell as nearly full because it checks voltage rather than actual capacity state. The headset then draws into real usable capacity quickly and cuts off. Seat the headset in the base, let it charge to a confirmed 4.2V terminal voltage, and the runtime estimate will reflect the true 1500mAh capacity.