Re: A lot of CEOs said the iPad wouldn't take off...
The Apple watch has wireless charging, which should help keep it charged, and I hope it can sync time from your iPhone (which hopefully can sync from the network), as that should avoid any need to fiddle with it if it does go flat.
(My quartz watch uses solar power to top up its battery, and syncs time with a radio signal, so it hasn't needed any attention since I bought it.)