Scala Rider Q3 Replacement Battery 3.7V 320mAh Li-Polymer

Scala Rider Q3 / Rider FM / Rider Solo — 3.7V Li-Polymer Replacement Battery (WW452050PL)

This is a 3.7V, 320mAh Li-Polymer replacement cell for the Scala Rider Q3, Rider FM, and Rider Solo motorcycle helmet communication headsets. It matches OEM part number WW452050PL and fits directly into the slim housing on the helmet unit. Voltage, capacity, and physical dimensions — 51.50 x 20.40 x 4.60mm — are matched to the original specification.

• Q3, Rider FM, and Rider Solo compatibility: These three headsets share the same chassis dimensions, 3.7V power rail, and BMS handshake protocol, which is why they all run the same WW452050PL cell. Swapping between models works because the connector and cell footprint are identical across the platform.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Q3 unit and confirmed the BMS accepted the pack without fault codes. The protection circuit responded correctly to both low-voltage cutoff and overcharge thresholds.
• First-charge protocol for Q3 units: Seat the headset in the Scala Rider charging cradle and run one full charge cycle before your first ride. The Q3's onboard BMS needs a complete cycle to log the new cell — skipping this step causes the talk-time indicator to read inaccurately for the first several uses.

Why the Q3 drops intercom mid-ride on a new battery

The Q3 runs both the Bluetooth audio stack and the intercom radio simultaneously, which creates brief current spikes that exceed what a degraded or partially conditioned cell can deliver. On a new replacement pack that hasn't completed a full conditioning cycle, the BMS can interpret these spikes as an overload event and momentarily cut output. This usually resolves after three to five full charge-discharge cycles once the cell's internal resistance settles. If dropouts persist past five cycles, measure resting voltage — it should sit at 3.7V or above after a full charge.

Charging cradle shows full charge but headset cuts off after a short session

A new Li-Polymer cell ships at storage voltage — roughly 3.6V — not at full charge. If the cradle detects a voltage already close to nominal, it may terminate the charge cycle early, leaving the cell only partially loaded. The headset then cuts off well before the rated capacity is used. Fix this by placing the headset in the cradle immediately after installation and leaving it for a full uninterrupted charge session — at least until the cradle indicator switches to complete. Check the cell voltage after removal; it should read 4.1–4.2V before first use.