I have designed yet a new Tetrinsic concept and have gone through and updated the concept Tetent model. 

I completely forgot how small this thing actually is, such that I was suprised on how large the USB Type-C connector was:

In the past, I looked at products and cars to see if I could get any design ideas, and one of them was to have a shallow but sharp bend in the surface so that the light hits slightly differently:

The main reason for the cut though was so that it looks like this from the 1st person perspective:

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To conclude, while I'm still not sure if the 8 solar panels would actually noticably improve battery life (it should be approx 200mA if it charged at 5V) but it sure sells the modern-day renewable engergy aesthetic.

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[1 July] I've tweaked Tetrinsic so that the full 52mm of active area is available. I've also made my logo 18mm large and added some cutouts for the chain so it looked more realistic.

The max power generation of 8 of those solar cells is 1.36W. Assuming 80% efficiency due to shadows (ball-chain, fingers, etc) and voltage conversion circuitry, Tetent might be able to absorb 1.088W when in sunlight.