About this replacement
Pure Evoke E-1S / Evoke Flow — 3.7V Li-ion Replacement Battery (E1)
This 3.7V, 8800mAh Li-ion battery replaces the original cell in the Pure Evoke E-1S, Evoke Flow, Evoke-2S, and related models. It restores wireless DAB reception to radios where the original pack no longer holds adequate charge. Capacity figures are taken from product data — 32.56Wh total energy storage.
- Evoke series shared power platform: The E-1S, Evoke Flow, and Evoke-2S all draw from the same 3.7V single-cell architecture with the same connector pinout and BMS handshake. One cell fits the platform because the DAB decoder and RF front-end both operate from the same regulated rail.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Evoke platform. The BMS accepted charge handshake without error, balanced correctly at full capacity, and the DAB decoder held stable lock throughout the discharge curve.
- First-scan protocol after installation: After fitting the new battery, let the radio run a full auto-scan before manual tuning. DAB station lists sit in volatile memory and are wiped when power is interrupted — the radio must rebuild its station index from scratch via a fresh RF scan.
Radio cutting out mid-station at low battery
The DAB decoder in the Evoke series needs a steady voltage to maintain its error-correction and stream-decode pipeline. When cell voltage sags below roughly 3.2V, the decoder starts dropping frames — the radio stutters, mutes, or reboots rather than playing degraded audio. A weakened original cell hits that sag point much earlier in its discharge curve than the rated capacity suggests. Fitting a fresh 8800mAh cell pushes the flat portion of the discharge curve significantly further before sag sets in.
Saved stations gone after battery swap
The Evoke E-1S stores its station list in volatile memory that loses state the moment power is cut — even briefly during a battery swap. This is not a fault with the replacement cell. After any power interruption, go to Menu → First Time Setup → Auto-tune and allow the radio to complete a full DAB scan. The radio will repopulate the station list from the RF environment and return to normal operation.