In practical terms, what does 'lithium battery management' mean for the TinyZero. Does it turn off so the battery does not go below a certain voltage? Also, does the lithium battery charge when the tinyzero is plugged in via the usb cable?

Any help/insight appreciated, and thanks in advance to anyone who replies 

In practical terms, what does 'lithium battery management' mean for the TinyZero. Does it turn off so the battery does not go below a certain voltage? Also, does the lithium battery charge when the tinyzero is plugged in via the usb cable?

Any help/insight appreciated, and thanks in advance to anyone who replies 

The batteries themselves have circuitry that shuts off their output when the voltage gets low enough.

The battery management on the TinyZero is just the charging circuit. When not plugged in, the TinyZero will draw power from the battery as long as the battery voltage doesn't get too low and the battery shuts off its output. When plugged in, the TinyZero draws power from USB while at the same time the USB is used to charge the battery.

Thanks so much for the info!!