Cleer Flow Replacement Battery 3.7V 800mAh Li-Polymer

Cleer Flow / Enduro ANC — 3.7V Li-Polymer Replacement Battery (PCT803035)

This 3.7V, 800mAh lithium-polymer cell replaces the original battery in the Cleer Flow and Cleer Enduro ANC wireless headsets. Both models use the PCT803035 pack to power the audio driver, active noise cancellation circuit, and wireless radio simultaneously. Swap this cell when your headset no longer holds a charge through a full listening session or call.

• Flow and Enduro ANC compatibility: Both headsets share the same battery bay dimensions (37.50 × 30.00 × 7.60mm), voltage rail, and connector orientation. The BMS in each model accepts the PCT803035 without requiring firmware changes or connector modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Cleer platform, confirming the BMS handshake completes correctly and the protection circuit trips at the expected low-voltage cutoff without false shutdowns under combined ANC and radio draw.
• First-cycle base station protocol: Seat the headset in its charging cradle and run a full uninterrupted charge cycle before use. The base station logs the new cell during this cycle — until it does, the talk-time estimate shown on any paired device will read inaccurate.

Why the Cleer Flow cuts out mid-call on a fresh battery

The Flow runs three loads at once: the audio driver, the ANC processor, and the wireless radio. During a call, all three draw current simultaneously, creating brief spikes that can trip the BMS protection circuit if the cell is not yet conditioned. A new cell at partial charge has higher internal resistance, which amplifies voltage sag under those spikes. This is not a faulty battery — it resolves after three to five full charge cycles as the cell reaches its rated capacity curve.

Base station shows full charge but headset shuts off after a few minutes

This happens when a replacement cell arrives at storage voltage — typically around 3.6V — rather than a depleted state the charger circuit expects. The base station reads the voltage as near-full and terminates the charge early without topping the cell off. The headset then powers on normally but drops out quickly once real load hits. Fix this by leaving the headset cradled for a full 60–90 minute charge session regardless of what the indicator shows, then power cycle the headset. Confirm the cell is accepting charge by checking that the base station LED cycles through its charging sequence rather than jumping straight to green.