Where did Min get the idea? When his former smartwatch stopped functioning, he set out to make his own (and make it better.)
"Once upon a time, I had a lovely Pebble Time smartwatch. I loved it so much I actually slapped a dBrand skin on it. Red and black carbon fiber. My Pebble ate Rolexes for breakfast."
The Mark V cannot keep track of time after the battery dies. That is not a problem thanks to BLE and a connection to a smartphone, which can keep the RTC's base time updated.
One upgrade with the new version of the watch is a larger battery. He estimates that now the Time Machine Mark V should run for about a month on a CR2032 coin cell battery. One of the largest consumers of battery life is the 7-segment displays.
Min admits that switching to display type would extend the battery's life, but is not happy with how it would look. But we have to agree that they are very striking and provide a retro look and feel.