If you have a daily routine like charging your phone, why not just charge your watch as well?

Seems like more cognitive effort to change routine just because you take a weekend trip.

It's fine if I don't need a different additional cable.

Right, I have a Garmin 245 that I regularly get 3-5 days on a charge (lots of GPS runs though) and I don't have a problem finding an hour here and there to charge it. Once a day would become a big frustration though, because I typically have a days window where I know I'll need to charge in the next 24 hours and can be flexible.