Power, battery & sleep

The badge has two sleep modes plus a normal active mode. Both sleep modes are driven from the lock screen, so they only take effect once the badge is locked.

Light sleep

When the lock screen has been idle for a while, the badge enters light sleep. In light sleep the CPU is paused but the badge wakes again quickly.

Idle delay: light sleep starts after 2 minutes of inactivity on the lock screen.
A small light-sleep indicator is shown on the lock screen while it is active.
Light sleep is only entered from the lock screen; it never starts while you are inside a menu.

What stops light sleep

The badge will not enter (or stay in) light sleep when:

USB is connected. The idle timer is reset so the badge stays responsive.
Sleep is inhibited (see Keeping the badge awake below).

Waking from light sleep

Light sleep can wake from two sources:

Wakeup	What happens
Key press	The light-sleep indicator is removed, the display refreshes, and the badge returns to the normal lock screen.
Timer	The badge briefly wakes to refresh the clock, then goes back to sleep.

The timer wakeup interval is the Sleep Interval value in Settings. If USB is connected while the badge is in light sleep, it leaves light sleep.

Deep sleep

Deep sleep is a much deeper power-down. Waking from deep sleep restarts the badge (it boots fresh).

Trigger: on the lock screen, hold the N key for 5 seconds.
The badge shows a deep-sleep screen, turns the backlight off, waits about two seconds (so you can release the key), then powers down.
Wakeup: deep sleep only wakes on a key press, and waking causes a reset (the badge boots up again rather than resuming).

The deep-sleep gesture only works on the lock screen.

Ship mode

Ship mode is the deepest power-off: it disconnects the battery from the system (the charger’s BATFET opens), so the badge draws no battery current at all. It is meant for shipping and long-term storage.

What happens: the battery is electrically disconnected. With no USB attached the badge powers off completely; while USB is connected the badge keeps running from USB and the battery stays disconnected.
Wake / exit: connect USB, or press the power-on button, to bring the badge back. Unlike deep sleep this is a full power-down, not a timed sleep.

There are three ways to enter ship mode:

Way in	How
Flash button	Hold the Flash button (the same button used to enter flash mode) for 3 seconds during normal operation. This is not the power-on button, which wakes the badge back up.
Expert menu	Main menu → Tools → Expert → Shipping Mode, then confirm the prompt.
Serial console	Send `SHIPMODE` after authenticating with `AUTH <pin>`.

Battery and charging

The lock screen shows the current battery level and power status.

Battery level is shown as a fill level from 0 to 100 %.
The level is re-sampled at most every 30 seconds, so the reading stays steady rather than flickering with small voltage changes.
If no battery is connected, the badge shows an empty battery outline with a diagonal strike-through.
A charging indicator appears while the battery is charging.
A USB indicator appears while USB is connected.

These indicators are refreshed each time the lock screen redraws.

Keeping the badge awake

Some activities hold the badge awake so it does not drop into light sleep. While at least one such “keep awake” reason is active, a caffeinated (coffee-cup) icon is shown on the lock screen and light sleep is suppressed. Up to eight such reasons can be active at once.

Auto-lock

Separately from sleep, the badge locks itself after a period of inactivity while you are inside the menus:

After 5 minutes without a key press, the badge returns to the lock screen.
Auto-lock is held off while a plugin that requests to prevent sleep is in the foreground.

At a glance

Mode	Trigger	Wake
Active	Normal use	—
Light sleep	Lock screen idle for 2 minutes	Any key (timer wakeups refresh the clock and return to sleep)
Deep sleep	Hold `N` for 5 seconds on the lock screen	Any key (badge resets)
Ship mode	Hold the Flash button 3 s, Expert menu, or `SHIPMODE`	Connect USB or press the power-on button