I calculate 8mW ((600mAh/264h)*3.6V).
Not that it really matters, factor in the multitude of practical
engineering issues and it looks bleak.
Eg. you have to have multiple cells in series to get the voltage
needed, extra charging circuitry of some sort, inefficiency in the
charging circuitry and the battery at low charge currents, indoor
lighting is quite a large difference etc etc
Read below for how much time my phone spends in any form of light, let
alone full sun.
I think you'll find if you did a proper engineering analysis taking
everything into account, then it just isn't practical.
To a mass market item like this, that's a LOT of money. Every single
cent counts in high volume consumer items like this.
Really?
I don't know if I'm an "average" user or not, but I would be lucky if
my phone spends a few percent of an average week in any sort of ambient
light let alone full sun.
I leave it in my bag at work and home, if I go out it's in my back
pocket, when I go to the gym it's in my bumbag, when I'm out
adventuring it's in the pack etc. In fact the only time it's really
getting any light is when I use it or I'm charging it!
So I would have to drastically change the usage of my phone to get any
benefit at all from solar power.
Dave