XP Deus WS1 Wireless Headphones Replacement Battery 3.7V 700mAh

XP Deus WS1 / WS2 / WS3 / WS4 Wireless Headphones — 3.7V Li-Polymer Replacement Battery (CP-XPWS)

This is a 3.7V, 700mAh lithium-polymer battery for the XP Deus WS1, WS2, WS3, and WS4 wireless headphone modules. These headphones act as the audio receiver in the XP Deus metal detector system — without a functional battery, the wireless link between the control unit and headphones drops entirely. Dimensions are 51.50 × 20.20 × 7.00mm, matching the original cell footprint.

• WS1–WS4 headphone compatibility: All four WS variants use the same battery footprint, voltage rail, and connector pinout. The BMS handshake is identical across the series, so a single cell covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a WS1 module. The BMS accepted the pack without fault flags, held stable voltage under the audio receiver load, and the wireless pairing with the control box stayed consistent throughout.
• Post-install initialisation on WS headphones: After fitting the new cell, charge the headphone module to full before pairing it with the detector. The WS modules track battery state from the first pairing handshake — skipping a full charge before that first sync causes the battery indicator on the control unit to read incorrectly for the first several sessions.

Why the WS headphone module loses the wireless link mid-session as the battery ages

The XP Deus wireless link between the control unit and WS headphones requires a sustained, stable voltage from the headphone battery. As a lithium-polymer cell ages, its internal resistance rises. Under the continuous RF receiver load, voltage sags below the threshold the WS module needs to maintain the 2.4GHz link — and the connection drops even though the battery indicator still shows charge remaining. The cell isn't flat; it just can't hold voltage under load anymore. Replacing the cell restores the stable voltage rail the RF module depends on.

WS module powers on but the control unit shows it as unpaired or offline

This happens when a freshly installed or long-stored cell sits below approximately 3.5V — the BMS enters a low-voltage protection state and limits output current. The WS module appears to boot, but it can't generate enough power to complete the RF handshake with the detector's control unit. Place the headphones on charge for at least 30 minutes before attempting to pair. Once the cell recovers above 3.6V, the BMS releases the current limit and the pairing sequence completes normally.