Charging & battery

The Metal and Ultra are battery-powered and charge over USB-C.

Use a 5 V charger only

Charge at USB-C, 5 V, 1 A. Do not use fast chargers above 5 V — it can damage the device. Don’t charge with a damaged USB-C cable.

Charging

1. Connect the USB-C cable to the charging port.
2. Connect to a USB power source (5 V, 1 A recommended).
3. The power-button LED double-blinks every 3 seconds while charging.
4. Initial charge: about 3 hours. Full charge: a little over 3 hours.

Before grinding, disconnect the USB-C cable — the feeder is designed to run on battery, not while plugged in.

No LED while charging? That’s usually normal

The charging double-blink only shows while the device is awake. After about 3 minutes the feeder goes to sleep and the LED turns off — charging continues in the background. Press the power button to wake it and see the charging pattern again. A fully-charged device also stops blinking. So a dark LED with the cable plugged in almost never means a defect.

Feeder stalling on every setting? Charge it first

A low battery can cause constant stalling on all speed settings — without showing any low-battery warning. Before troubleshooting a stalling feeder, charge it fully (or test with the USB-C cable connected). If the stalling stops, it was the battery.

Runtime

Battery	Li-Ion 3.7 V, 2000 mAh
Runtime	Up to ~20 hours (depends on speed setting)
Charge time	~3 hours

Battery care

• Charge the battery at least once a month.
• Avoid fully discharging it when you can.
• For long storage, leave it at 40–60% charge.
• Expected life: ~500 charge cycles.
• Replace the battery through authorised service only — don’t open the device or swap battery types.

If the LED won’t light and the disc won’t move, the battery is empty — charge it. If it still won’t charge, try a different cable, gently clean the USB-C port, and if it persists contact support.