Battery
The small metal disk in the upper left corner is a small lithium battery. This battery does not provide power to the
IC like the 3.3V system does, but to relevant systems inside the IC that allow for a quick reconnection to satellites.
The time to first fix will about ~29 seconds, but after it has a lock, that battery will allow for a two second time to
first fix. This is known as a hot start and lasts for four hours after the board is powered down. The battery provides
over a years worth of power to the backup system and charges slowly when the board is powered. To charge it to
full, leave your module plugged in for 48 hours.
LEDs
There's is a red power LED just to the left of the bottom Qwiic connector and near the board's edge to indicate that
the board is powered. There is another LED just above the power LED labeled PPS that is connected to the Pulse
Per Second line. When connected to a satellite, this line generates a pulse that is synchronized with a GPS or
UTC time grid. By default, you'll see one pulse a second.
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