You can change the battery and set up the synchronization etc - you will though have to find info on this online, it is not hard but the info you need is not in the manual - battery life is ok. The problem I have is a loose/spinning push button (the bottom one) which seems to have happened for no good reason - so there maybe an issue of specific design faults. Otherwise it is a desirable watch.
Had this watch for 3 years now and it's just now had the batterys replaced. Been a absolutely brilliant watch. Never gone wrong looks cool. Had a few expensive watches and this is by far the best watch I've had. Treat yourself you won't regret it +++++ ;-)
After just 18 months the hands have gone out of sync with the digital display which means the battery is nearly gone. This just isn't good enough - my previous Casio watch battery lasted 6 years on average and I could change it myself at a cost of about £1.50. Instead I have to send the watch back to Tissot, wait about 4 weeks and pay about £55 for a new battery.
It's also difficult to read and has no backlight so is useless in the dark.