u forgot, charge daily!
and if you're travelling and forget to bring along the charger on your nightstand, you're screwed, then you're wearing a dark device on your wrist.
"What's the time Sir" - "...uhhmmm... I forgot to charge it last night"
Right, because you need to charge it daily if you only use it as a watch... Obviously Apple doesn't know how to make a digital watch and never will... (sic). BTW, used as a watch and nothing else, it can probably last 14 days and more.
How do I know this?
Well... The:
- Volume of the Ipod Nano
77 * 40 * 5.4 = 16662
- Volume of the small watch
13170 (38*33*10.5) + 1206 = 15176
- Volume of the big watch
15880 (42*36*10.5) + 1700 = 17500
I separated the volume of the bottom part since it probably cannot be used for battery space.
The big watch has just about the same volume as the Ipod Nano (or 5-6% less if removing the podium part), which doesn't benefit from a lower power Amoled screen, a newer SOC on a newer process, more efficient bluetooth chip and less memory (less power usage). A lower power SOC can easily reduce non screen power usage by 100% from the nano.
You know how long the nano lasts:
10 hours playing music on bluetooth. (amended from earlier which was wired). (wired is 33h)
3.5h playing videos
4h playing photo slideshow
So, basically, this large watch should easily play music, serve as a watch and collect sensor info (with the motion processor) for nearly 1 whole day over bluetooth considering improvement in comm efficiency. (not a typical usage...)
For other functions, notifications, they're not on the whole taking much more processing power than playing music over bluetooth.
The main issue is the screen, with a lcd screen 4h of use would be the max. With dark or mixed background, the Amoled probably takes 50-80% less power on average than the LCD screen (Web browsing/reading books tends to be whiter). So, it would be possible for the big watch to last 8-12h with an Amoled screen if used constantly on mostly dark to mixed background.
A Normal day is 16h and nobody is interacting with their watch 8h a day... (at least hope so...).
Looking at a realistic intense use of notifications/response rate of 160/day with 1.5 minutes (some much longer, some very short) on average, you get 240 minutes of screen time (4h of screen time). That seems a crazy, spending 4h interacting with your watch... But, hey we are looking at extreme use here.
That means for those people, the big Apple watch should be able to play music 5-7h and handle intensie notifications/replies (160 for 4h a day) and sensor data collection if there has been no improvement in the SOC or com chips in the 2.5 years since the Nano.
Even the smaller watch should accomplish this feat, looking at the nano specs and process and screen improvements.
Of course, if you use it less, and most people will not have 160 notifications of play 5h+ plus of music per day. If you don't play music at all you'd get 2 days easy.