About this replacement
Astro A50 — 3.7V Li-Polymer Replacement Battery (SRP603443)
This 3.7V 800mAh Li-Polymer cell replaces the original battery in the Astro A50 wireless gaming headset. It fits the A50 directly, restoring wireless audio without replacing the full headset. Voltage and capacity match the OEM spec: 3.7V, 800mAh (2.96Wh).
- A50 platform fit: The A50 routes audio and DECT radio draw through a single cell. This pack matches the OEM voltage rail and connector so the base station's charge circuit initialises correctly — no wiring changes needed.
- Bench tested on actual hardware: We ran the cell through the A50 base station and confirmed the BMS completed its handshake, accepted a full charge cycle, and held voltage under combined audio and radio load without triggering a cutoff.
- First-charge protocol for the A50: Seat the headset in the base station and leave it for a complete uninterrupted charge cycle before use. The A50 base needs to log the new cell's capacity before its talk-time estimate becomes accurate — skipping this step produces misleading charge indicators early on.
Why the A50 base station shows a charging error after a battery swap
The A50 base station handshakes with the battery's BMS before it begins charging. If the headset is docked before the replacement cell reaches a minimum threshold voltage, the base can flag a fault and refuse the charge cycle. A fresh replacement cell shipped at storage voltage — typically around 3.0–3.2V — sits below what the base expects on first dock. Leaving the headset seated in the base without interruption allows the charge circuit to step through its initialisation sequence and clear the error.
A50 cutting out mid-session on a new battery
The A50 combines continuous audio decoding with an active DECT radio transmitter — both drawing from the same small cell simultaneously. Under that combined load, a cell with any internal resistance above spec will sag below the headset's cutoff voltage even if the indicator still shows charge remaining. This is different from short talk time caused by a shallow first cycle. If cutouts happen suddenly with no warning, check that the cell completed at least one full charge cycle in the base and that the base contacts are clean — corroded contacts add resistance and worsen voltage sag under load.