Razer PL503450 Wireless Headset Replacement Battery 3.7V 1000mAh

Razer Ari Ultimate Wireless 7.1 — 3.7V Li-Polymer Replacement Battery (PL503450)

This 3.7V, 1000mAh Li-Polymer cell replaces the internal battery in the Razer Ari Ultimate Wireless 7.1 Surround Sound Gaming Headset and compatible Barracuda series wireless headsets. It restores wireless audio and surround sound processing after the original cell degrades. Dimensions are 54.00 × 33.80 × 7.00mm — confirm these against your existing cell before fitting.

• Ari Ultimate and Barracuda series compatibility: These headsets share the same flat Li-Polymer cell format, 3.7V nominal rail, and connector pinout. The BMS in each model expects the same charge profile, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through the Ari Ultimate's base station charging circuit and confirmed the BMS accepted the new pack, completed the charge handshake, and held a stable 4.2V at full charge with no error flags triggered.
• Base station logging on first install: Place the headset in the base station immediately after fitting the new cell and leave it for a complete charge cycle before use. The Ari Ultimate's firmware logs the new cell during this first cycle — skipping it causes the talk-time indicator to read inaccurately for several sessions.

Why the Ari Ultimate cuts out mid-session under combined audio and radio draw

The Ari Ultimate runs its 7.1 surround sound DSP and the 2.4GHz wireless radio from the same cell simultaneously. At peak load, this combined draw can spike well above the steady-state current the cell handles during light use. A degraded or deeply discharged cell hits the BMS undervoltage threshold under that spike and drops the wireless link. A new cell at full charge handles the surge without triggering cutoff — if cutouts continue after fitting, check that the base station charged the pack to 4.2V before the first session.

Base station shows full charge but headset shuts off after a few minutes

This happens when a replacement cell arrives at storage voltage — typically around 3.6–3.7V — and the base station misreads it as already charged after a short top-up cycle. The cell has not been through a full charge cycle, so usable capacity is far below rated. Seat the headset in the base, let it run a complete uninterrupted charge until the indicator confirms full, then remove it. After that first full cycle the base station logs the correct cell state and the behaviour stops.