Sena SC-HR01 Replacement Battery 3.7V 80mAh Li-Polymer

Sena SC-HR01 / 10U Series — 3.7V Li-Polymer Replacement Battery (YP401225P)

This 3.7V, 80mAh Li-Polymer cell replaces part number YP401225P in the Sena SC-HR01, 10U-HR-01, and 10U-AR-01 motorcycle Bluetooth headsets. It matches the original cell's dimensions (26.00 × 11.74 × 4.20mm) and voltage rail exactly. Swap it when your headset no longer holds a charge or cuts out mid-ride.

• SC-HR01, 10U-HR-01, and 10U-AR-01 compatibility: All three models share the same compact housing, 3.7V rail, and YP401225P cell footprint. The BMS in each unit expects the same voltage profile and physical connector, so one cell covers the full group.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SC-HR01 platform. The onboard BMS accepted the pack without fault codes, balanced to 4.2V at full charge, and held the low-voltage cutoff at the expected threshold under combined Bluetooth radio and audio draw.
• First-cycle base station logging: Seat the headset in its base station and run a complete charge cycle before your first call. The Sena base needs to log the new cell before its talk-time gauge reads accurately — skipping this step causes the indicator to misreport remaining capacity.

Why the SC-HR01 cuts out mid-call even with a new battery installed

The SC-HR01 draws simultaneously from the Bluetooth radio, the audio amplifier, and the intercom circuit. That combined peak draw can briefly pull cell voltage below the BMS cutoff threshold — especially on a fresh cell that hasn't completed a conditioning cycle. The BMS reads this voltage dip as a low-cell event and shuts the headset down to protect the cell. Running three to five full charge-discharge cycles brings internal resistance down and reduces the depth of those voltage sags during peak draw.

Base station shows charging but headset powers off after a few seconds

A replacement cell shipped at storage voltage (typically 3.6–3.7V) hasn't yet been logged by the base station's charge controller. The base may report a full or near-full charge before the cell has actually reached 4.2V, because it's reading stored state data from the previous cell. Leave the headset docked for a full uninterrupted charge cycle — until the base indicator confirms completion — before powering on. Once the charge controller has completed one full cycle with the new cell, the behaviour stops.