Barely Painted

Inkscape

"Inkscape"https://inkscape.org/en/

There a lot of different Bluetooth headsets on the market, for example " Jaybird FREEDOM 2" has battery, with capacity less than 70 mAh.

I don't even think about this

You probably mean “Bold Knot” as far as I know, this is only startup, which not released finial product.As far as I can say, small battery can't provide enough power for smartphone, not yet, maybe in the future. Battery capacity in this project less than 70 mAh, phone battery capacity at least 2500 mAh, which almost 36 times smaller.LiPo battery discharge rate very high and this charging board can provide at least 500mAh out current, which mean, this battery can provide power for charging a phone only for a couple of seconds.This is basics of thermodynamics.My answer on question “can I made power bank so tiny which will charge the phone properly” is no, not quite yet, maybe in the future, we discover new chemicals combination which will be more efficient.

This is actually my first idea, I explain why this didn't work in video https://youtu.be/oz_pYvHD0nc?t=8m50s

Thanks. I fixed this.

Thanks for support. USB case very small, this is not easy precisely cutting and filming in the same time. I found that this is the best position for filming, completely agree that's this looks unsafe, but actual work, has been done very carefully, behind the camera. It is much better to use rotary tool.

That's true

Thanks for the question. This power bank can provide power for charging a phone only for a couple of seconds. I wrote more detail about this in the end.