About this replacement
Bosch Nyon Bordcomputer — 3.7V Li-ion Replacement Battery (S6EA)
This 3.7V 700mAh Li-ion cell replaces the internal battery in the Bosch Nyon and Nyon Bordcomputer e-bike display units. The Nyon combines GPS navigation, speed tracking, and e-bike system control in a single handlebar-mounted unit. When the original cell degrades, the display loses power, drops navigation mid-ride, or fails to hold a charge between uses.
- Nyon and Nyon Bordcomputer compatibility: Both variants run from the same 3.7V cell with the same connector footprint and BMS communication protocol. The S6EA part number covers both. Physical dimensions are 40.00 × 31.10 × 5.90mm — measure your original before fitting if yours is a modified or third-party Nyon housing.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Nyon platform, confirming the BMS accepted the cell without fault codes, and that the display powered on cleanly through the boot sequence with GPS and navigation functions active.
- Post-installation satellite acquisition: After fitting this cell, power the Nyon fully on outdoors before your first ride. A cold start after full power removal takes 5–10 minutes for initial satellite fix. Subsequent warm starts drop back under a minute once the unit has stored recent ephemeris data.
Why the Nyon shuts off without a low-battery warning
The Nyon reads battery percentage from a fuel gauge calibrated to the original cell's discharge curve. A degraded or replaced cell with a slightly different curve causes the gauge to read incorrectly — the unit reports 20% remaining, then hits the hardware cutoff voltage and shuts off without warning. The fix is to run two or three full charge-to-discharge cycles after fitting the new cell. This allows the fuel gauge to recalibrate against the actual discharge curve and restore accurate percentage readings.
Saved routes missing after battery replacement
The Nyon stores some route and settings data in RAM that is held by the battery. A full power-down during battery removal clears this volatile memory. Downloaded routes stored in flash memory survive the swap, but any unsaved in-progress routes or recently added POIs may not. Before opening the unit, sync your routes to the Bosch eBike Connect app — this ensures everything is backed up and can be pushed back to the device after the new cell is fitted.