I'm not sure I can really compare well; while my Series 4 does not last as well as my Series 3, my Series 4 is LTE and the 3 was only GPS -- so you'd expect some extra battery use. However, as someone who uses the watch for sleep tracking, when I put the phone on the charger at night (about 2 hours before I go to bed) it is down about 35% now -- my Series 3 would be around 50%.