Range Extender — MAXON BIKEDRIVE AIR
Range Extender · BX250E
Maxon Range Extender — Install & Use
Doubling your range. The BX250E adds 250 Wh in a bottle-cage-mounted pack that hot-swaps in the field.
How it works
- Acts like a portable power bank — automatically charges your main battery while you ride.
- 650 Wh combined capacity (400 Wh main + 250 Wh range extender).
- Hot-swappable mid-ride — carry a second extender for very long rides and swap without tools.
- Mounts on a standard bottle-cage location with the Maxon-compatible bracket.
Connect for the first time
- Mount the Range Extender on the bottle-cage bracket. The retention rubber band must be in place — a loose extender can fall during a ride and the cable can get caught in the wheel.
- Open the charging port covers on both the bike and the extender.
- Connect the cable at both ends. Rotate each bayonet lock until it “clicks”.
- Press the Range Extender button. Green LED on the extender = on. Green LED at the top of POWERTAB = system has detected it.
- Both green LEDs steady = charging your main battery. You’re ready to ride.
Safety: never ride with a loose cable. Verify both bayonet locks are engaged AND the rubber band is secured before every ride.
LED reference (Range Extender)
| LED | Meaning | Action |
|---|---|---|
| Green steady | Connected, charging main battery | Normal. |
| Green flashing | Range Extender on, but not detected by bike | Check both bayonet locks. |
| Red | Range Extender error | Power-cycle: hold button 5 sec, wait 10 sec, press to turn back on. If persists → dealer. |
| Amber | Charging by external charger (extender being topped up) | Normal. |
| No LED | Off or empty | Press button — should see 5 white SOC bars. If empty, charge. |
SOC display (5 bars)
Press the button on the Range Extender briefly to see its current charge — 5 white LEDs in 20% increments. Press again to wake the system; auto-sleeps after a few seconds.
Tips for getting the most out of it
- Connect at the START of the ride. The extender will keep your main battery topped up the whole way — much better than waiting until main is half-empty.
- Carry a spare for ultra-distance rides. Hot-swap in seconds during a break.
- Check both SOCs — POWERTAB shows main battery (7 bars), Range Extender button shows extender (5 bars).
- Charging stops automatically when the main battery hits 100%. That’s normal, not a fault.
Cable cross-compatibility — important
The same BX250E battery cell is used on Maxon AIR and AIR S systems, but the cables are different. An AIR-system Range Extender is NOT cross-compatible with an AIR S system — sockets differ. If you order a Range Extender separately, verify the cable matches your bike system. Wrong cable = re-ship cost and delay.
Need more help? Contact us or visit the Maxon Support hub.
Maxon BIKEDRIVE AIR S system — 90 Nm / 620 W / 400% assist / 2 kg motor · 400 Wh main battery + 250 Wh range extender · 24-month manufacturer warranty.