Inside TRMNL > Devices > Settings are a few options related to battery consumption.
Key among them is Sleep Mode.
What is Sleep Mode?
Whether TRMNL is on your desk or your kitchen counter, you're probably not there to look at it 24 hours per day. At least, we hope not.
To save power (and recharge your device less often) we offer Sleep Mode. Enabling this will instruct your device to not* wake up and fetch content (the usual behavior) for an extended period of time, determined by you.
If your device is set to fetch new screens every 15 minutes, for example, you can enable Sleep Mode from 10p - 6a (example) and reduce your daily refreshes by 32x, or 4x per hour, for 8 hours.
Each refresh expends just a tiny bit of power, but eliminating 32x refreshes per day that you'll never see can add weeks to your battery life.
See advanced details about TRMNL power consumption here.
What is the Sleep Screen?
When your device is asleep, we figure you want to know about it. That way you don't assume it's 105 degrees outside when in fact, that was the weather 5 hours ago.
Our simple approach to this is a sleep screen, which looks like this:
But some TRMNL owners prefer their device to linger on the last-shown content, which we respect.
Simply disable "Sleep Screen" to show the last piece of content while your device sleeps. It will not expend any more energy to do this, and there is no risk of "screen burning" given all sleep periods are <= 24 hours.
Customizing your Sleep Screen
Do you prefer to design your own sleep screen? Let us know in live chat and we'll prioritize that feature.