Cardo Q1 Replacement Battery 3.7V 320mAh Li-Polymer

Cardo Q1 / Q3 — 3.7V Li-Polymer Replacement Battery (WW452050PL_C)

This 3.7V, 320mAh Li-Polymer cell replaces the original WW452050PL_C pack inside the Cardo Q1 and Q3 Bluetooth motorcycle headsets. It restores power to the audio and radio circuits after the original cell has degraded through repeated charge cycles. Voltage and capacity match the OEM spec exactly.

• Q1 and Q3 compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. The BMS in each headset communicates with the cell over the same protocol, so one replacement cell covers both platforms without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Q1 platform. The BMS accepted the pack without fault codes, balanced correctly, and the audio and DECT radio circuits drew current within expected limits across the full discharge curve.
• First charge with the base station: Place the headset in the Cardo charging cradle and run a full charge cycle before making a call. The base station logs the new cell during this cycle and calibrates the talk-time estimate. Skipping this step causes the headset to report inaccurate charge levels for the first several uses.

Why the Q1 cuts out mid-call even with a new battery installed

The Q1 runs its Bluetooth audio codec and DECT radio simultaneously during a call. That combined draw creates brief current spikes the new cell must handle cleanly. If the cell has not completed its first full charge cycle, internal resistance remains slightly elevated and voltage can sag enough under those spikes to trigger the BMS undervoltage cutoff. A full initial charge through the base station resolves this on most units.

Base station shows solid charge light but headset dies after a few minutes

A replacement cell arrives at storage voltage — typically around 3.6V — not full charge. Some base stations read this as a charged pack and show a full indicator before the charge cycle actually completes. The headset then cuts off quickly because the cell never reached its true full-charge voltage of 4.2V. Leave the headset in the cradle for a complete uninterrupted charge cycle and verify the indicator goes through the full charging sequence before removing it.